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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" aria-label="pagination"> <a href="" class="pagination-previous is-invisible">Previous </a> <a href="/search/?searchtype=author&query=Spagnolo%2C+B&start=50" class="pagination-next" >Next </a> <ul class="pagination-list"> <li> <a href="/search/?searchtype=author&query=Spagnolo%2C+B&start=0" class="pagination-link is-current" aria-label="Goto page 1">1 </a> </li> <li> <a href="/search/?searchtype=author&query=Spagnolo%2C+B&start=50" class="pagination-link " aria-label="Page 2" aria-current="page">2 </a> </li> </ul> </nav> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2407.13837">arXiv:2407.13837</a> <span> [<a href="https://arxiv.org/pdf/2407.13837">pdf</a>, <a href="https://arxiv.org/format/2407.13837">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Breakdown of Measurement-Induced Phase Transitions Under Information Loss </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Paviglianiti%2C+A">Alessio Paviglianiti</a>, <a href="/search/cond-mat?searchtype=author&query=Di+Fresco%2C+G">Giovanni Di Fresco</a>, <a href="/search/cond-mat?searchtype=author&query=Silva%2C+A">Alessandro Silva</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2407.13837v1-abstract-short" style="display: inline;"> The dynamics of a quantum-many body system subject to measurements is naturally described by an ensemble of quantum trajectories, which can feature measurement-induced phase transitions (MIPTs). This phenomenon cannot be revealed through ensemble-averaged observables, but it requires the ability to discriminate each trajectory separately, making its experimental observation extremely challenging.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13837v1-abstract-full').style.display = 'inline'; document.getElementById('2407.13837v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2407.13837v1-abstract-full" style="display: none;"> The dynamics of a quantum-many body system subject to measurements is naturally described by an ensemble of quantum trajectories, which can feature measurement-induced phase transitions (MIPTs). This phenomenon cannot be revealed through ensemble-averaged observables, but it requires the ability to discriminate each trajectory separately, making its experimental observation extremely challenging. We explore the fate of MIPTs under an observer's reduced ability to discriminate each measurement outcome. This introduces uncertainty in the state of the system, causing observables to probe a restricted subset of trajectories rather than a single one. By introducing an exactly-solvable Liouvillian model, we examine how long-time spatial correlations are influenced by varying degrees of trajectory averaging. We compute exactly the correlation matrix, Liouvillian gap, and entanglement negativity to demonstrate that averaging over multiple realizations introduces an effective finite lengthscale, beyond which long-range correlations are suppressed. This suggests that partial averaging over trajectories conceals the critical features of individual realizations, thereby blurring away the signatures of distinct measurement-induced phases. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2407.13837v1-abstract-full').style.display = 'none'; document.getElementById('2407.13837v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 July, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 6 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2404.04275">arXiv:2404.04275</a> <span> [<a href="https://arxiv.org/pdf/2404.04275">pdf</a>, <a href="https://arxiv.org/ps/2404.04275">ps</a>, <a href="https://arxiv.org/format/2404.04275">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Soft Condensed Matter">cond-mat.soft</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Comment on "Non-reciprocal topological solitons in active metamaterials" </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2404.04275v1-abstract-short" style="display: inline;"> In the recent work "Non-reciprocal topological solitons in active metamaterials" (see arXiv:2312.03544v1), for an analytical understanding of the system under consideration, the authors derive an ordinary differential equation for the sine-Gordon (anti)soliton velocity, with the perturbation theory in the adiabatic approximation, via the inverse scattering transform formalism, see Eq. (3) in their… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.04275v1-abstract-full').style.display = 'inline'; document.getElementById('2404.04275v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2404.04275v1-abstract-full" style="display: none;"> In the recent work "Non-reciprocal topological solitons in active metamaterials" (see arXiv:2312.03544v1), for an analytical understanding of the system under consideration, the authors derive an ordinary differential equation for the sine-Gordon (anti)soliton velocity, with the perturbation theory in the adiabatic approximation, via the inverse scattering transform formalism, see Eq. (3) in their work. Here we note that the latter equation for the (anti)soliton velocity also follows from an energy balance approach. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2404.04275v1-abstract-full').style.display = 'none'; document.getElementById('2404.04275v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">1 page; comment on arXiv:2312.03544</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2311.13464">arXiv:2311.13464</a> <span> [<a href="https://arxiv.org/pdf/2311.13464">pdf</a>, <a href="https://arxiv.org/format/2311.13464">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Enhancement of stability of metastable states in the presence of L茅vy noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">A. A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">C. Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2311.13464v1-abstract-short" style="display: inline;"> The barrier crossing event for superdiffusion in the form of symmetric L茅vy flights is investigated. We derive from the fractional Fokker-Planck equation a general differential equation with the corresponding conditions useful to calculate the mean residence time of a particle in a fixed interval for an arbitrary smooth potential profile, in particular metastable, with a sink and a L茅vy noise with… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13464v1-abstract-full').style.display = 'inline'; document.getElementById('2311.13464v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2311.13464v1-abstract-full" style="display: none;"> The barrier crossing event for superdiffusion in the form of symmetric L茅vy flights is investigated. We derive from the fractional Fokker-Planck equation a general differential equation with the corresponding conditions useful to calculate the mean residence time of a particle in a fixed interval for an arbitrary smooth potential profile, in particular metastable, with a sink and a L茅vy noise with an arbitrary index $伪$. A closed expression in quadrature of the nonlinear relaxation time for L茅vy flights with the index $伪=1$ in cubic metastable potential is obtained. Enhancement of the mean residence time in the metastable state, analytically derived, due to L茅vy noise is found. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2311.13464v1-abstract-full').style.display = 'none'; document.getElementById('2311.13464v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 November, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 3 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.15219">arXiv:2307.15219</a> <span> [<a href="https://arxiv.org/pdf/2307.15219">pdf</a>, <a href="https://arxiv.org/format/2307.15219">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.3390/ma16175972">10.3390/ma16175972 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Axion field influence on Josephson junction quasipotential </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Grimaudo%2C+R">Roberto Grimaudo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Troisi%2C+A">Antonio Troisi</a>, <a href="/search/cond-mat?searchtype=author&query=Filatrella%2C+G">Giovanni Filatrella</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.15219v2-abstract-short" style="display: inline;"> The direct effect of an axion field on Josephson junctions is analyzed through the consequences on the effective potential barrier that prevents the junction from switching from the superconducting to the finite-voltage state. We describe a method to reliably compute the quasipotential with stochastic simulations, which allows to span the coupling parameter from weakly interacting axion to tight i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15219v2-abstract-full').style.display = 'inline'; document.getElementById('2307.15219v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.15219v2-abstract-full" style="display: none;"> The direct effect of an axion field on Josephson junctions is analyzed through the consequences on the effective potential barrier that prevents the junction from switching from the superconducting to the finite-voltage state. We describe a method to reliably compute the quasipotential with stochastic simulations, which allows to span the coupling parameter from weakly interacting axion to tight interactions. As a result, we obtain that the axion field induces a change in the potential barrier, therefore determining a significant detectable effect for such a kind of elusive particle. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15219v2-abstract-full').style.display = 'none'; document.getElementById('2307.15219v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 2 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 27 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 3 figures. This article belongs to the Special Issue "Physics and Application of Superconductivity"</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Materials 2023, 16(17), 5972 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.13338">arXiv:2306.13338</a> <span> [<a href="https://arxiv.org/pdf/2306.13338">pdf</a>, <a href="https://arxiv.org/format/2306.13338">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.cnsns.2023.107796">10.1016/j.cnsns.2023.107796 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Noise-induced, ac-stabilized sine-Gordon breathers: Emergence and statistics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.13338v1-abstract-short" style="display: inline;"> Noisy and ac forcing can cooperatively lead to the emergence of sine-Gordon breathers robust to dissipation. This phenomenon is studied, for both Neumann and periodic boundary conditions (NBC and PBC, respectively), at different values of the main system parameters, such as the noise intensity and the ac frequency-amplitude pair. In all the considered cases, nonmonotonicities of the probability of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.13338v1-abstract-full').style.display = 'inline'; document.getElementById('2306.13338v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.13338v1-abstract-full" style="display: none;"> Noisy and ac forcing can cooperatively lead to the emergence of sine-Gordon breathers robust to dissipation. This phenomenon is studied, for both Neumann and periodic boundary conditions (NBC and PBC, respectively), at different values of the main system parameters, such as the noise intensity and the ac frequency-amplitude pair. In all the considered cases, nonmonotonicities of the probability of generating only breathers versus the noise strength are observed, implying that optimal noise ranges for the breather formation process exist. Within the latter scenarios, the statistics of the breathers' number, position, and amplitude are analyzed. The number of breathers is found to grow, on average, with the noise amplitude. The breathers' spatial distribution is sharply peaked at the system's edges for NBC, whereas it is essentially uniform for PBC. The average breather amplitude is dictated by the ac frequency-amplitude pair. Finally, a size analysis shows that the minimum system length for the generation mechanism is given by the typical breather half-width (width) in NBC (PBC). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.13338v1-abstract-full').style.display = 'none'; document.getElementById('2306.13338v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.00683">arXiv:2306.00683</a> <span> [<a href="https://arxiv.org/pdf/2306.00683">pdf</a>, <a href="https://arxiv.org/format/2306.00683">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.chaos.2024.115088">10.1016/j.chaos.2024.115088 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heat-transfer fingerprint of Josephson breathers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.00683v1-abstract-short" style="display: inline;"> A sine-Gordon breather enhances the heat transfer in a thermally biased long Josephson junction. This solitonic channel allows for the tailoring of the local temperature throughout the system. Furthermore, the phenomenon implies a clear thermal fingerprint for the breather, and thus a 'non-destructive' breather detection strategy is proposed here. Distinct breathing frequencies result in morpholog… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00683v1-abstract-full').style.display = 'inline'; document.getElementById('2306.00683v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.00683v1-abstract-full" style="display: none;"> A sine-Gordon breather enhances the heat transfer in a thermally biased long Josephson junction. This solitonic channel allows for the tailoring of the local temperature throughout the system. Furthermore, the phenomenon implies a clear thermal fingerprint for the breather, and thus a 'non-destructive' breather detection strategy is proposed here. Distinct breathing frequencies result in morphologically different local temperature peaks, which can be identified in an experiment. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00683v1-abstract-full').style.display = 'none'; document.getElementById('2306.00683v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2301.05164">arXiv:2301.05164</a> <span> [<a href="https://arxiv.org/pdf/2301.05164">pdf</a>, <a href="https://arxiv.org/format/2301.05164">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.chaos.2023.113382">10.1016/j.chaos.2023.113382 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> ac-locking of thermally-induced sine-Gordon breathers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2301.05164v1-abstract-short" style="display: inline;"> A complete framework for exciting and detecting thermally-induced, stabilized sine-Gordon breathers in ac-driven long Josephson junctions is developed. The formation of long-time stable breathers locked to the ac source occurs for a sufficiently high temperature. The latter emerges as a powerful control parameter, allowing for the remarkably stable localized modes to appear. Nonmonotonic behaviors… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.05164v1-abstract-full').style.display = 'inline'; document.getElementById('2301.05164v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2301.05164v1-abstract-full" style="display: none;"> A complete framework for exciting and detecting thermally-induced, stabilized sine-Gordon breathers in ac-driven long Josephson junctions is developed. The formation of long-time stable breathers locked to the ac source occurs for a sufficiently high temperature. The latter emerges as a powerful control parameter, allowing for the remarkably stable localized modes to appear. Nonmonotonic behaviors of both the breather generation probability and the energy spatial correlations versus the thermal noise strength are found. The junction's resistive switching characteristics provides a clear experimental signature of the breather. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2301.05164v1-abstract-full').style.display = 'none'; document.getElementById('2301.05164v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures; Supp Mat: 4 pages, 2 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.03938">arXiv:2205.03938</a> <span> [<a href="https://arxiv.org/pdf/2205.03938">pdf</a>, <a href="https://arxiv.org/format/2205.03938">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Pattern Formation and Solitons">nlin.PS</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.chaos.2023.113115">10.1016/j.chaos.2023.113115 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Breather dynamics in a stochastic sine-Gordon equation: evidence of noise-enhanced stability </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.03938v1-abstract-short" style="display: inline;"> The dynamics of sine-Gordon breathers is studied in the presence of dissipative and stochastic perturbations. Taking a stationary breather with a random phase value as the initial state, the performed simulations demonstrate that a spatially-homogeneous noisy source can make the oscillatory excitation more stable, i.e., it enables the latter to last significantly longer than it would in a noise-fr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03938v1-abstract-full').style.display = 'inline'; document.getElementById('2205.03938v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.03938v1-abstract-full" style="display: none;"> The dynamics of sine-Gordon breathers is studied in the presence of dissipative and stochastic perturbations. Taking a stationary breather with a random phase value as the initial state, the performed simulations demonstrate that a spatially-homogeneous noisy source can make the oscillatory excitation more stable, i.e., it enables the latter to last significantly longer than it would in a noise-free scenario. Both the frequency domain and the localization of energy are examined to document the effectiveness of the noise-enhanced stability phenomenon, which emerges as a nonmonotonic behavior of an average characteristic time for the breather as a function of the noise intensity. The influence of the mode's starting frequency on the results and their robustness against an additional thermal background are also addressed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.03938v1-abstract-full').style.display = 'none'; document.getElementById('2205.03938v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Chaos Solitons Fractals 168 113115 (2023) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.01990">arXiv:2205.01990</a> <span> [<a href="https://arxiv.org/pdf/2205.01990">pdf</a>, <a href="https://arxiv.org/format/2205.01990">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.cnsns.2022.106736">10.1016/j.cnsns.2022.106736 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Supratransmission-induced travelling breathers in long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.01990v1-abstract-short" style="display: inline;"> The emergence of travelling sine-Gordon breathers due to the nonlinear supratransmission effect is theoretically studied in a long Josephson junction driven by suitable magnetic pulses, taking into account the presence of dissipation, a current bias, and a thermal noise source. The simulations clearly indicate that, depending on the pulse's shape and the values of the main system parameters, such… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.01990v1-abstract-full').style.display = 'inline'; document.getElementById('2205.01990v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.01990v1-abstract-full" style="display: none;"> The emergence of travelling sine-Gordon breathers due to the nonlinear supratransmission effect is theoretically studied in a long Josephson junction driven by suitable magnetic pulses, taking into account the presence of dissipation, a current bias, and a thermal noise source. The simulations clearly indicate that, depending on the pulse's shape and the values of the main system parameters, such a configuration can effectively yield breather excitations only. Furthermore, a nonmonotonic behavior of the breather-only generation probability is observed as a function of the noise intensity. Finally, the dynamics of the supratransmission-induced breathers is characterized by looking at quantities such as their radiative decay lifetime and the medium's energy. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.01990v1-abstract-full').style.display = 'none'; document.getElementById('2205.01990v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">27 pages, 12 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Commun. Nonlinear Sci. Numer. Simul. 106736 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.10971">arXiv:2201.10971</a> <span> [<a href="https://arxiv.org/pdf/2201.10971">pdf</a>, <a href="https://arxiv.org/format/2201.10971">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.105.033007">10.1103/PhysRevD.105.033007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Josephson junction-based axion detection through resonant activation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Grimaudo%2C+R">Roberto Grimaudo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Filatrella%2C+G">Giovanni Filatrella</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.10971v2-abstract-short" style="display: inline;"> We discuss the resonant activation phenomenon on a Josephson junction due to the coupling of the Josephson system with axions. We show how such an effect can be exploited for axion detection. A nonmonotonic behavior, with a minimum, of the mean switching time from the superconducting to the resistive state versus the ratio of the axion energy and the Josephson plasma energy is found. We demonstrat… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10971v2-abstract-full').style.display = 'inline'; document.getElementById('2201.10971v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.10971v2-abstract-full" style="display: none;"> We discuss the resonant activation phenomenon on a Josephson junction due to the coupling of the Josephson system with axions. We show how such an effect can be exploited for axion detection. A nonmonotonic behavior, with a minimum, of the mean switching time from the superconducting to the resistive state versus the ratio of the axion energy and the Josephson plasma energy is found. We demonstrate how variations in switching times make it possible to detect the presence of the axion field. An experimental protocol for observing axions through their coupling with a Josephson system is proposed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10971v2-abstract-full').style.display = 'none'; document.getElementById('2201.10971v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 105, 033007 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2201.10277">arXiv:2201.10277</a> <span> [<a href="https://arxiv.org/pdf/2201.10277">pdf</a>, <a href="https://arxiv.org/format/2201.10277">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.chaos.2022.112039">10.1016/j.chaos.2022.112039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Generation of travelling sine-Gordon breathers in noisy long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=De+Santis%2C+D">Duilio De Santis</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2201.10277v1-abstract-short" style="display: inline;"> The generation of travelling sine-Gordon breathers is achieved through the nonlinear supratransmission effect in a magnetically driven long Josephson junction, in the presence of losses, a current bias, and a thermal noise source. We demonstrate how to exclusively induce breather modes by means of controlled magnetic pulses. A nonmonotonic behavior of the breather-only generation probability is ob… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10277v1-abstract-full').style.display = 'inline'; document.getElementById('2201.10277v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2201.10277v1-abstract-full" style="display: none;"> The generation of travelling sine-Gordon breathers is achieved through the nonlinear supratransmission effect in a magnetically driven long Josephson junction, in the presence of losses, a current bias, and a thermal noise source. We demonstrate how to exclusively induce breather modes by means of controlled magnetic pulses. A nonmonotonic behavior of the breather-only generation probability is observed as a function of the noise intensity. An experimental protocol providing evidence of the Josephson breather's existence is proposed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2201.10277v1-abstract-full').style.display = 'none'; document.getElementById('2201.10277v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 January, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Chaos Solitons Fractals 158 112039 (2022) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2006.14299">arXiv:2006.14299</a> <span> [<a href="https://arxiv.org/pdf/2006.14299">pdf</a>, <a href="https://arxiv.org/format/2006.14299">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevResearch.2.043332">10.1103/PhysRevResearch.2.043332 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Voltage drop across Josephson junctions for L茅vy noise detection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Filatrella%2C+G">Giovanni Filatrella</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Pierro%2C+V">Vincenzo Pierro</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2006.14299v3-abstract-short" style="display: inline;"> We propose to characterize L茅vy-distributed stochastic fluctuations through the measurement of the average voltage drop across a current-biased Josephson junction. We show that the noise induced switching process in the Josephson washboard potential can be exploited to reveal and characterize L茅vy fluctuations, also if embedded in a thermal noisy background. The measurement of the average voltage… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.14299v3-abstract-full').style.display = 'inline'; document.getElementById('2006.14299v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2006.14299v3-abstract-full" style="display: none;"> We propose to characterize L茅vy-distributed stochastic fluctuations through the measurement of the average voltage drop across a current-biased Josephson junction. We show that the noise induced switching process in the Josephson washboard potential can be exploited to reveal and characterize L茅vy fluctuations, also if embedded in a thermal noisy background. The measurement of the average voltage drop as a function of the noise intensity allows to infer the value of the stability index that characterizes L茅vy-distributed fluctuations. An analytical estimate of the average velocity in the case of a L茅vy-driven escape process from a metastable state well agrees with the numerical calculation of the average voltage drop across the junction. The best performances are reached at small bias currents and low temperatures, \emph{i.e.}, when both thermally activated and quantum tunneling switching processes can be neglected. The effects discussed in this work pave the way toward an effective and reliable method to characterize L茅vy components eventually present in an unknown noisy signal. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2006.14299v3-abstract-full').style.display = 'none'; document.getElementById('2006.14299v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 December, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 June, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Research 2, 043332 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.11621">arXiv:1911.11621</a> <span> [<a href="https://arxiv.org/pdf/1911.11621">pdf</a>, <a href="https://arxiv.org/format/1911.11621">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/ab3ccb">10.1088/1742-5468/ab3ccb <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On quantumness in multi-parameter quantum estimation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">Alexander A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.11621v2-abstract-short" style="display: inline;"> In this article we derive a measure of quantumness in quantum multi-parameter estimation problems. We can show that the ratio between the mean Uhlmann Curvature and the Fisher Information provides a figure of merit which estimates the amount of incompatibility arising from the quantum nature of the underlying physical system. This ratio accounts for the discrepancy between the attainable precision… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11621v2-abstract-full').style.display = 'inline'; document.getElementById('1911.11621v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.11621v2-abstract-full" style="display: none;"> In this article we derive a measure of quantumness in quantum multi-parameter estimation problems. We can show that the ratio between the mean Uhlmann Curvature and the Fisher Information provides a figure of merit which estimates the amount of incompatibility arising from the quantum nature of the underlying physical system. This ratio accounts for the discrepancy between the attainable precision in the simultaneous estimation of multiple parameters and the precision predicted by the Cram茅r-Rao bound. As a testbed for this concept, we consider a quantum many-body system in thermal equilibrium, and explore the quantum compatibility of the model across its phase diagram. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.11621v2-abstract-full').style.display = 'none'; document.getElementById('1911.11621v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 2 Figures. arXiv admin note: text overlap with arXiv:1911.10196</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Stat. Mech. Theory Exp. 2019, 094010 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1911.10196">arXiv:1911.10196</a> <span> [<a href="https://arxiv.org/pdf/1911.10196">pdf</a>, <a href="https://arxiv.org/format/1911.10196">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physrep.2019.11.002">10.1016/j.physrep.2019.11.002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Geometry of quantum phase transitions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1911.10196v1-abstract-short" style="display: inline;"> In this article we provide a review of geometrical methods employed in the analysis of quantum phase transitions and non-equilibrium dissipative phase transitions. After a pedagogical introduction to geometric phases and geometric information in the characterisation of quantum phase transitions, we describe recent developments of geometrical approaches based on mixed-state generalisation of the Be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.10196v1-abstract-full').style.display = 'inline'; document.getElementById('1911.10196v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1911.10196v1-abstract-full" style="display: none;"> In this article we provide a review of geometrical methods employed in the analysis of quantum phase transitions and non-equilibrium dissipative phase transitions. After a pedagogical introduction to geometric phases and geometric information in the characterisation of quantum phase transitions, we describe recent developments of geometrical approaches based on mixed-state generalisation of the Berry-phase, i.e. the Uhlmann geometric phase, for the investigation of non-equilibrium steady-state quantum phase transitions (NESS-QPTs ). Equilibrium phase transitions fall invariably into two markedly non-overlapping categories: classical phase transitions and quantum phase transitions, whereas in NESS-QPTs this distinction may fade off. The approach described in this review, among other things, can quantitatively assess the quantum character of such critical phenomena. This framework is applied to a paradigmatic class of lattice Fermion systems with local reservoirs, characterised by Gaussian non-equilibrium steady states. The relations between the behaviour of the geometric phase curvature, the divergence of the correlation length, the character of the criticality and the gap - either Hamiltonian or dissipative - are reviewed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1911.10196v1-abstract-full').style.display = 'none'; document.getElementById('1911.10196v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">94 pages, 15 figures, 399 references, To appear in: Physics Reports (2019). arXiv admin note: text overlap with arXiv:1305.4527, arXiv:quant-ph/0701061 by other authors</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.04125">arXiv:1905.04125</a> <span> [<a href="https://arxiv.org/pdf/1905.04125">pdf</a>, <a href="https://arxiv.org/format/1905.04125">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/ab33f8">10.1088/1742-5468/ab33f8 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Haldane Model at finite temperature </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Leonforte%2C+L">Luca Leonforte</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">Alexander A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.04125v1-abstract-short" style="display: inline;"> We consider the Haldane model, a 2D topological insulator whose phase is defined by the Chern number. We study its phases as temperature varies by means of the Uhlmann number, a finite temperature generalization of the Chern number. Because of the relation between the Uhlmann number and the dynamical transverse conductivity of the system, we evaluate also the conductivity of the model. This analys… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.04125v1-abstract-full').style.display = 'inline'; document.getElementById('1905.04125v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.04125v1-abstract-full" style="display: none;"> We consider the Haldane model, a 2D topological insulator whose phase is defined by the Chern number. We study its phases as temperature varies by means of the Uhlmann number, a finite temperature generalization of the Chern number. Because of the relation between the Uhlmann number and the dynamical transverse conductivity of the system, we evaluate also the conductivity of the model. This analysis does not show any sign of a phase transition induced by the temperature, nonetheless it gives a better understanding of the fate of the topological phase with the increase of the temperature, and it provides another example of the usefulness of the Uhlmann number as a novel tool to study topological properties at finite temperature. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.04125v1-abstract-full').style.display = 'none'; document.getElementById('1905.04125v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 5 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.04118">arXiv:1905.04118</a> <span> [<a href="https://arxiv.org/pdf/1905.04118">pdf</a>, <a href="https://arxiv.org/format/1905.04118">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/ab35e9">10.1088/1742-5468/ab35e9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On critical properties of Berry curvature in Kitaev honeycomb model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bascone%2C+F">Francesco Bascone</a>, <a href="/search/cond-mat?searchtype=author&query=Leonforte%2C+L">Luca Leonforte</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.04118v1-abstract-short" style="display: inline;"> We analyse the Kitaev honeycomb model, by means of the Berry curvature with respect to Hamiltonian parameters. We concentrate on the ground-state vortex-free sector, which allows us to exploit an appropriate Fermionisation technique. The parameter space includes a time-reversal breaking term which provides an analytical headway to study the curvature in phases in which it would otherwise vanish. T… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.04118v1-abstract-full').style.display = 'inline'; document.getElementById('1905.04118v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.04118v1-abstract-full" style="display: none;"> We analyse the Kitaev honeycomb model, by means of the Berry curvature with respect to Hamiltonian parameters. We concentrate on the ground-state vortex-free sector, which allows us to exploit an appropriate Fermionisation technique. The parameter space includes a time-reversal breaking term which provides an analytical headway to study the curvature in phases in which it would otherwise vanish. The curvature is then analysed in the limit in which the time-reversal-symmetry-breaking perturbation vanishes. This provides remarkable information about the topological phase transitions of the model. A non-critical behaviour is found in the Berry curvature itself, which shows a distinctive behaviour in the different phases. The analysis of the first derivative shows a critical behaviour around the transition point. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.04118v1-abstract-full').style.display = 'none'; document.getElementById('1905.04118v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">arXiv admin note: substantial text overlap with arXiv:1810.04149</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1810.04149">arXiv:1810.04149</a> <span> [<a href="https://arxiv.org/pdf/1810.04149">pdf</a>, <a href="https://arxiv.org/format/1810.04149">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.99.205155">10.1103/PhysRevB.99.205155 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Finite temperature geometric properties of the Kitaev honeycomb model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Bascone%2C+F">Francesco Bascone</a>, <a href="/search/cond-mat?searchtype=author&query=Leonforte%2C+L">Luca Leonforte</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1810.04149v2-abstract-short" style="display: inline;"> We study finite temperature topological phase transitions of the Kitaev's spin honeycomb model in the vortex-free sector with the use of the recently introduced mean Uhlmann curvature. We employ an appropriate Fermionisation procedure to study the system as a two-band p-wave superconductor described by a BdG Hamiltonian. This allows to study relevant quantities such as Berry and mean Uhlmann curva… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.04149v2-abstract-full').style.display = 'inline'; document.getElementById('1810.04149v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1810.04149v2-abstract-full" style="display: none;"> We study finite temperature topological phase transitions of the Kitaev's spin honeycomb model in the vortex-free sector with the use of the recently introduced mean Uhlmann curvature. We employ an appropriate Fermionisation procedure to study the system as a two-band p-wave superconductor described by a BdG Hamiltonian. This allows to study relevant quantities such as Berry and mean Uhlmann curvatures in a simple setting. More specifically, we consider the spin honeycomb in the presence of an external magnetic field breaking time reversal symmetry. The introduction of such an external perturbation opens a gap in the phase of the system characterised by non-Abelian statistics, and makes the model to belong to a symmetry protected class, so that the Uhmann number can be analysed. We first consider the Berry curvature on a particular evolution line over the phase diagram. The mean Uhlmann curvature and the Uhlmann number are then analysed considering the system to be in a Gibbs state at finite temperature. Then, we show that the mean Uhlmann curvature describes a cross-over effect of the phases at high temperature. We also find an interesting nonmonotonic behaviour of the Uhlmann number as a function of the temperature in the trivial phase, which is due to the partial filling of the conduction band around Dirac points. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1810.04149v2-abstract-full').style.display = 'none'; document.getElementById('1810.04149v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 February, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 October, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 8 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 99, 205155 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1806.08592">arXiv:1806.08592</a> <span> [<a href="https://arxiv.org/pdf/1806.08592">pdf</a>, <a href="https://arxiv.org/format/1806.08592">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Strongly Correlated Electrons">cond-mat.str-el</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1038/s41598-019-45546-9">10.1038/s41598-019-45546-9 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Uhlmann number in translational invariant systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Leonforte%2C+L">Luca Leonforte</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1806.08592v3-abstract-short" style="display: inline;"> We define the Uhlmann number as an extension of the Chern number, and we use this quantity to describe the topology of 2D translational invariant Fermionic systems at finite temperature. We consider two paradigmatic systems and we study the changes in their topology through the Uhlmann number. Through the linear response theory we linked two geometrical quantities of the system, the mean Uhlmann c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08592v3-abstract-full').style.display = 'inline'; document.getElementById('1806.08592v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1806.08592v3-abstract-full" style="display: none;"> We define the Uhlmann number as an extension of the Chern number, and we use this quantity to describe the topology of 2D translational invariant Fermionic systems at finite temperature. We consider two paradigmatic systems and we study the changes in their topology through the Uhlmann number. Through the linear response theory we linked two geometrical quantities of the system, the mean Uhlmann curvature and the Uhlmann number, to directly measurable physical quantities, i.e. the dynamical susceptibility and to the dynamical conductivity, respectively. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1806.08592v3-abstract-full').style.display = 'none'; document.getElementById('1806.08592v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 June, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 June, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Scientific Reports 9, 9106 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1802.01095">arXiv:1802.01095</a> <span> [<a href="https://arxiv.org/pdf/1802.01095">pdf</a>, <a href="https://arxiv.org/format/1802.01095">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevApplied.11.044078">10.1103/PhysRevApplied.11.044078 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Josephson-based threshold detector for L茅vy distributed fluctuations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Pierro%2C+V">Vincenzo Pierro</a>, <a href="/search/cond-mat?searchtype=author&query=Filatrella%2C+G">Giovanni Filatrella</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1802.01095v3-abstract-short" style="display: inline;"> We propose a threshold detector for L茅vy distributed fluctuations based on a Josephson junction. The L茅vy noise current added to a linearly ramped bias current results in clear changes in the distribution of switching currents out of the zero-voltage state of the junction. We observe that the analysis of the cumulative distribution function of the switching currents supplies information on both th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01095v3-abstract-full').style.display = 'inline'; document.getElementById('1802.01095v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1802.01095v3-abstract-full" style="display: none;"> We propose a threshold detector for L茅vy distributed fluctuations based on a Josephson junction. The L茅vy noise current added to a linearly ramped bias current results in clear changes in the distribution of switching currents out of the zero-voltage state of the junction. We observe that the analysis of the cumulative distribution function of the switching currents supplies information on both the characteristics shape parameter $伪$ of the L茅vy statistics and the intensity of the fluctuations. Moreover, we discuss a theoretical model which allows to extract characteristic features of the L茅vy fluctuations from a measured distribution of switching currents. In view of this results, this system can effectively find an application as a detector for a L茅vy signal embedded in a noisy background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1802.01095v3-abstract-full').style.display = 'none'; document.getElementById('1802.01095v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 4 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. Applied 11, 044078 (2019) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1710.07560">arXiv:1710.07560</a> <span> [<a href="https://arxiv.org/pdf/1710.07560">pdf</a>, <a href="https://arxiv.org/ps/1710.07560">ps</a>, <a href="https://arxiv.org/format/1710.07560">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Uhlmann curvature in dissipative phase transitions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1710.07560v3-abstract-short" style="display: inline;"> We study the mean Uhlmann curvature in fermionic systems undergoing a dissipative driven phase transition. We consider a paradigmatic class of lattice fermion systems in non-equilibrium steady-state of an open system with local reservoirs, which are characterised by a Gaussian fermionic steady state. In the thermodynamical limit, in systems with translational invariance we show that a singular beh… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07560v3-abstract-full').style.display = 'inline'; document.getElementById('1710.07560v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1710.07560v3-abstract-full" style="display: none;"> We study the mean Uhlmann curvature in fermionic systems undergoing a dissipative driven phase transition. We consider a paradigmatic class of lattice fermion systems in non-equilibrium steady-state of an open system with local reservoirs, which are characterised by a Gaussian fermionic steady state. In the thermodynamical limit, in systems with translational invariance we show that a singular behaviour of the Uhlmann curvature represents a sufficient criterion for criticalities, in the sense of diverging correlation length, and it is not otherwise sensitive to the closure of the Liouvillian dissipative gap. In finite size systems, we show that the scaling behaviour of the mean Uhlmann curvature maps faithfully the phase diagram, and a relation to the dissipative gap is put forward. We argue that the mean Uhlmann phase can shade light upon the nature of non equilibrium steady state criticality in particular with regard to the role played by quantum vs classical fluctuations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1710.07560v3-abstract-full').style.display = 'none'; document.getElementById('1710.07560v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 October, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 3 figures with appendix of 10 pages, 1 figure</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1702.01641">arXiv:1702.01641</a> <span> [<a href="https://arxiv.org/pdf/1702.01641">pdf</a>, <a href="https://arxiv.org/format/1702.01641">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1361-6528/aa5e75">10.1088/1361-6528/aa5e75 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Anomalous transport effects on switching currents of graphene-based Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Pierro%2C+V">Vincenzo Pierro</a>, <a href="/search/cond-mat?searchtype=author&query=Filatrella%2C+G">Giovanni Filatrella</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1702.01641v1-abstract-short" style="display: inline;"> We explore the effect of noise on the ballistic graphene-based small Josephson junctions in the framework of the resistively and capacitively shunted model. We use the non-sinusoidal current-phase relation specific for graphene layers partially covered by superconducting electrodes. The noise induced escapes from the metastable states, when the external bias current is ramped, give the switching c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01641v1-abstract-full').style.display = 'inline'; document.getElementById('1702.01641v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1702.01641v1-abstract-full" style="display: none;"> We explore the effect of noise on the ballistic graphene-based small Josephson junctions in the framework of the resistively and capacitively shunted model. We use the non-sinusoidal current-phase relation specific for graphene layers partially covered by superconducting electrodes. The noise induced escapes from the metastable states, when the external bias current is ramped, give the switching current distribution, i.e. the probability distribution of the passages to finite voltage from the superconducting state as a function of the bias current, that is the information more promptly available in the experiments. We consider a noise source that is a mixture of two different types of processes: a Gaussian contribution to simulate an uncorrelated ordinary thermal bath, and non-Gaussian, $伪$-stable (or L茅vy) term, generally associated to non-equilibrium transport phenomena. We find that the analysis of the switching current distribution makes it possible to efficiently detect a non-Gaussian noise component in a Gaussian background. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1702.01641v1-abstract-full').style.display = 'none'; document.getElementById('1702.01641v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 6 February, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.07426">arXiv:1609.07426</a> <span> [<a href="https://arxiv.org/pdf/1609.07426">pdf</a>, <a href="https://arxiv.org/ps/1609.07426">ps</a>, <a href="https://arxiv.org/format/1609.07426">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Populations and Evolution">q-bio.PE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Modeling of Sensory Characteristics Based on the Growth of Food Spoilage Bacteria </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">D. Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Denaro%2C+G">G. Denaro</a>, <a href="/search/cond-mat?searchtype=author&query=Giarratana%2C+F">F. Giarratana</a>, <a href="/search/cond-mat?searchtype=author&query=Giuffrida%2C+A">A. Giuffrida</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzola%2C+S">S. Mazzola</a>, <a href="/search/cond-mat?searchtype=author&query=Basilone%2C+G">G. Basilone</a>, <a href="/search/cond-mat?searchtype=author&query=Aronica%2C+S">S. Aronica</a>, <a href="/search/cond-mat?searchtype=author&query=Bonanno%2C+A">A. Bonanno</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1609.07426v1-abstract-short" style="display: inline;"> During last years theoretical works shed new light and proposed new hypothesis on the mechanisms which regulate the time behaviour of biological populations in different natural systems. Despite of this, the role of environmental variables in ecological systems is still an open question. Filling this gap of knowledge is a crucial task for a deeper comprehension of the dynamics of biological popula… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.07426v1-abstract-full').style.display = 'inline'; document.getElementById('1609.07426v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.07426v1-abstract-full" style="display: none;"> During last years theoretical works shed new light and proposed new hypothesis on the mechanisms which regulate the time behaviour of biological populations in different natural systems. Despite of this, the role of environmental variables in ecological systems is still an open question. Filling this gap of knowledge is a crucial task for a deeper comprehension of the dynamics of biological populations in real ecosystems. In this work we study how the dynamics of food spoilage bacteria influences the sensory characteristics of fresh fish specimens. This topic is crucial for a better understanding of the role played by the bacterial growth on the organoleptic properties, and for the quality evaluation and risk assessment of food products. We therefore analyze the time behaviour, in fresh fish specimens, of sensory characteristics starting from the growth curves of two spoilage bacterial communities. The theoretical study, initially based on a deterministic model, exploits experimental temperature profiles. As a first step, a model of predictive microbiology is used to reproduce the experimental behaviour of the two bacterial populations. Afterwards, the theoretical bacterial growths are converted, through suitable differential equations, into "sensory" scores, based on the Quality Index Method (QIM), a scoring system for freshness and quality sensory estimation of fishery products. As a third step, the theoretical curves of QIM scores are compared with the experimental data obtained by sensory analysis. Finally, the differential equations for QIM scores are modified by adding terms of multiplicative white noise, which mimics the effects of uncertainty and variability in sensory analysis. A better agreement between experimental and theoretical QIM scores is observed, in some cases, in the presence of suitable values of noise intensity respect to the deterministic analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.07426v1-abstract-full').style.display = 'none'; document.getElementById('1609.07426v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">25 pages, 12 figures, 1 table; to be published in Math. Model. Nat. Phenom</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.07266">arXiv:1511.07266</a> <span> [<a href="https://arxiv.org/pdf/1511.07266">pdf</a>, <a href="https://arxiv.org/format/1511.07266">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Populations and Evolution">q-bio.PE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Noise Induced Phenomena in the Dynamics of Two Competing Species </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">D. Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Giuffrida%2C+A">A. Giuffrida</a>, <a href="/search/cond-mat?searchtype=author&query=Denaro%2C+G">G. Denaro</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">N. Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Curcio%2C+L">L. Curcio</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Mazzola%2C+S">S. Mazzola</a>, <a href="/search/cond-mat?searchtype=author&query=Basilone%2C+G">G. Basilone</a>, <a href="/search/cond-mat?searchtype=author&query=Bonanno%2C+A">A. Bonanno</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1511.07266v3-abstract-short" style="display: inline;"> Noise through its interaction with the nonlinearity of the living systems can give rise to counter-intuitive phenomena. In this paper we shortly review noise induced effects in different ecosystems, in which two populations compete for the same resources. We also present new results on spatial patterns of two populations, while modeling real distributions of anchovies and sardines. The transient d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.07266v3-abstract-full').style.display = 'inline'; document.getElementById('1511.07266v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.07266v3-abstract-full" style="display: none;"> Noise through its interaction with the nonlinearity of the living systems can give rise to counter-intuitive phenomena. In this paper we shortly review noise induced effects in different ecosystems, in which two populations compete for the same resources. We also present new results on spatial patterns of two populations, while modeling real distributions of anchovies and sardines. The transient dynamics of these ecosystems are analyzed through generalized Lotka-Volterra equations in the presence of multiplicative noise, which models the interaction between the species and the environment. We find noise induced phenomena such as quasi-deterministic oscillations, stochastic resonance, noise delayed extinction, and noise induced pattern formation. In addition, our theoretical results are validated with experimental findings. Specifically the results, obtained by a coupled map lattice model, well reproduce the spatial distributions of anchovies and sardines, observed in a marine ecosystem. Moreover, the experimental dynamical behavior of two competing bacterial populations in a meat product and the probability distribution at long times of one of them are well reproduced by a stochastic microbial predictive model. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.07266v3-abstract-full').style.display = 'none'; document.getElementById('1511.07266v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">23 pages, 8 figures; to be published in Math. Model. Nat. Phenom. (2016)</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1511.04899">arXiv:1511.04899</a> <span> [<a href="https://arxiv.org/pdf/1511.04899">pdf</a>, <a href="https://arxiv.org/format/1511.04899">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2016/05/054012">10.1088/1742-5468/2016/05/054012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Effects of L茅vy noise on the dynamics of sine-Gordon solitons in long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1511.04899v1-abstract-short" style="display: inline;"> We numerically investigate the generation of solitons in current-biased long Josephson junctions in relation to the superconducting lifetime and the voltage drop across the device. The dynamics of the junction is modelled with a sine-Gordon equation driven by an oscillating field and subject to an external non-Gaussian noise. A wide range of $伪$-stable L茅vy distributions is considered as noise sou… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.04899v1-abstract-full').style.display = 'inline'; document.getElementById('1511.04899v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1511.04899v1-abstract-full" style="display: none;"> We numerically investigate the generation of solitons in current-biased long Josephson junctions in relation to the superconducting lifetime and the voltage drop across the device. The dynamics of the junction is modelled with a sine-Gordon equation driven by an oscillating field and subject to an external non-Gaussian noise. A wide range of $伪$-stable L茅vy distributions is considered as noise source, with varying stability index $伪$ and asymmetry parameter $尾$. In junctions longer than a critical length, the mean switching time (MST) from superconductive to the resistive state assumes a values independent of the device length. Here, we demonstrate that such a value is directly related to the mean density of solitons which move into or from the washboard potential minimum corresponding to the initial superconductive state. Moreover, we observe: (i) a connection between the total mean soliton density and the mean potential difference across the junction; (ii) an inverse behavior of the mean voltage in comparison with the MST, with varying the junction length; (iii) evidences of non-monotonic behaviors, such as stochastic resonant activation and noise enhanced stability, of MST versus the driving frequency and noise intensity for different values of $伪$ and $尾$; (iv) finally, these non-monotonic behaviors are found to be related to the mean density of solitons formed along the junction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1511.04899v1-abstract-full').style.display = 'none'; document.getElementById('1511.04899v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 November, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">24 pages, 8 figures, submitted to J. Stat. Mech.: Theory Exp. arXiv admin note: text overlap with arXiv:1406.4813</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Statistical Mechanics: Theory and Experiment, Volume 2016, May 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1510.05624">arXiv:1510.05624</a> <span> [<a href="https://arxiv.org/pdf/1510.05624">pdf</a>, <a href="https://arxiv.org/format/1510.05624">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2016/05/054016">10.1088/1742-5468/2016/05/054016 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Quantum dissipative dynamics of a bistable system in the sub-Ohmic to super-Ohmic regime </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Magazz%C3%B9%2C+L">Luca Magazz霉</a>, <a href="/search/cond-mat?searchtype=author&query=Carollo%2C+A">Angelo Carollo</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1510.05624v1-abstract-short" style="display: inline;"> We investigate the quantum dynamics of a multilevel bistable system coupled to a bosonic heat bath beyond the perturbative regime. We consider different spectral densities of the bath, in the transition from sub-Ohmic to super-Ohmic dissipation, and different cutoff frequencies. The study is carried out by using the real-time path integral approach of the Feynman-Vernon influence functional. We fi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.05624v1-abstract-full').style.display = 'inline'; document.getElementById('1510.05624v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1510.05624v1-abstract-full" style="display: none;"> We investigate the quantum dynamics of a multilevel bistable system coupled to a bosonic heat bath beyond the perturbative regime. We consider different spectral densities of the bath, in the transition from sub-Ohmic to super-Ohmic dissipation, and different cutoff frequencies. The study is carried out by using the real-time path integral approach of the Feynman-Vernon influence functional. We find that, in the crossover dynamical regime characterized by damped \emph{intrawell} oscillations and incoherent tunneling, the short time behavior and the time scales of the relaxation starting from a nonequilibrium initial condition depend nontrivially on the spectral properties of the heat bath. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1510.05624v1-abstract-full').style.display = 'none'; document.getElementById('1510.05624v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 October, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Stat. Mech. (2016) 054016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1503.03043">arXiv:1503.03043</a> <span> [<a href="https://arxiv.org/pdf/1503.03043">pdf</a>, <a href="https://arxiv.org/format/1503.03043">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.91.235412">10.1103/PhysRevB.91.235412 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Stabilization of quantum metastable states by dissipation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">D. Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Magazz%C3%B9%2C+L">L. Magazz霉</a>, <a href="/search/cond-mat?searchtype=author&query=Caldara%2C+P">P. Caldara</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1503.03043v1-abstract-short" style="display: inline;"> Normally, quantum fluctuations enhance the escape from metastable states in the presence of dissipation. Here we show that dissipation can enhance the stability of a quantum metastable system, consisting of a particle moving in a strongly asymmetric double well potential, interacting with a thermal bath. We find that the escape time from the metastable state has a nonmonotonic behavior versus the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.03043v1-abstract-full').style.display = 'inline'; document.getElementById('1503.03043v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1503.03043v1-abstract-full" style="display: none;"> Normally, quantum fluctuations enhance the escape from metastable states in the presence of dissipation. Here we show that dissipation can enhance the stability of a quantum metastable system, consisting of a particle moving in a strongly asymmetric double well potential, interacting with a thermal bath. We find that the escape time from the metastable state has a nonmonotonic behavior versus the system-bath coupling and the temperature, producing a stabilizing effect. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1503.03043v1-abstract-full').style.display = 'none'; document.getElementById('1503.03043v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 March, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 3 figures, submitted to Phys. Rev. B</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. B 91, 235412 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.05924">arXiv:1502.05924</a> <span> [<a href="https://arxiv.org/pdf/1502.05924">pdf</a>, <a href="https://arxiv.org/format/1502.05924">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Design of a Lambda configuration in artificial coherent nanostructures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Di+Stefano%2C+P+G">P. G. Di Stefano</a>, <a href="/search/cond-mat?searchtype=author&query=Paladino%2C+E">E. Paladino</a>, <a href="/search/cond-mat?searchtype=author&query=D%27Arrigo%2C+A">A. D'Arrigo</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Falci%2C+G">G. Falci</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1502.05924v1-abstract-short" style="display: inline;"> The implementation of a three-level Lambda System in artificial atoms would allow to perform advanced control tasks typical of quantum optics in the solid state realm, with photons in the $\mathrm{渭m}$/mm range. However hardware constraints put an obstacle since protection from decoherence is often conflicting with efficient coupling to external fields. We address the problem of performing convent… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.05924v1-abstract-full').style.display = 'inline'; document.getElementById('1502.05924v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.05924v1-abstract-full" style="display: none;"> The implementation of a three-level Lambda System in artificial atoms would allow to perform advanced control tasks typical of quantum optics in the solid state realm, with photons in the $\mathrm{渭m}$/mm range. However hardware constraints put an obstacle since protection from decoherence is often conflicting with efficient coupling to external fields. We address the problem of performing conventional STImulated Raman Adiabatic Passage (STIRAP) in the presence of low-frequency noise. We propose two strategies to defeat decoherence, based on "optimal symmetry breaking" and dynamical decoupling. We suggest how to apply to the different implementations of superconducting artificial atoms, stressing the key role of non-Markovianity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.05924v1-abstract-full').style.display = 'none'; document.getElementById('1502.05924v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.04037">arXiv:1501.04037</a> <span> [<a href="https://arxiv.org/pdf/1501.04037">pdf</a>, <a href="https://arxiv.org/format/1501.04037">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> </div> <p class="title is-5 mathjax"> Sine-Gordon breathers generation in driven long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.04037v4-abstract-short" style="display: inline;"> We consider a long Josephson junction excited by a suitable external ac-signal, in order to generate control and detect breathers. Studying the nonlinear supratransmission phenomenon in a nonlinear sine-Gordon chain sinusoidally driven, Geniet and Leon explored the bifurcation of the energy transmitted into the chain and calculated a threshold $A (蠅)$ for the external driving signal amplitude, at… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.04037v4-abstract-full').style.display = 'inline'; document.getElementById('1501.04037v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.04037v4-abstract-full" style="display: none;"> We consider a long Josephson junction excited by a suitable external ac-signal, in order to generate control and detect breathers. Studying the nonlinear supratransmission phenomenon in a nonlinear sine-Gordon chain sinusoidally driven, Geniet and Leon explored the bifurcation of the energy transmitted into the chain and calculated a threshold $A (蠅)$ for the external driving signal amplitude, at which the energy flows into the system by breathers modes. I numerically study the continuous sine-Gordon model, describing the dynamics of the phase difference in a long Josephson junction, in order to deeply investigate the "continuous limit" modifications to this threshold. Wherever the energy flows into the system due to the nonlinear supratransmission, a peculiar breather localization areas appear in a $(A, 蠅)$ parameters space. The emergence of these areas depends on the damping parameter value, the bias current, and the waveform of driving external signal. The robustness of generated breathers is checked by introducing into the model a thermal noise source to mimic the environmental fluctuations. Presented results allows one to consider a cryogenic experiment for creation and detection of Josephson breathers. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.04037v4-abstract-full').style.display = 'none'; document.getElementById('1501.04037v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 16 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 3 figures. The updated version of this work can be found in arXiv:2201.10277 and arXiv:2205.01990</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.7467">arXiv:1412.7467</a> <span> [<a href="https://arxiv.org/pdf/1412.7467">pdf</a>, <a href="https://arxiv.org/format/1412.7467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.92.032123">10.1103/PhysRevE.92.032123 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Dissipative dynamics in a quantum bistable system: Crossover from weak to strong damping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Magazz%C3%B9%2C+L">Luca Magazz霉</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Grifoni%2C+M">Milena Grifoni</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1412.7467v2-abstract-short" style="display: inline;"> The dissipative dynamics of a quantum bistable system coupled to a Ohmic heat bath is investigated beyond the spin-boson approximation. Within the path-integral approach to quantum dissipation, we propose an approximation scheme which exploits the separation of time scales between intra- and interwell (tunneling) dynamics. The resulting generalized master equation for the populations in a space lo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.7467v2-abstract-full').style.display = 'inline'; document.getElementById('1412.7467v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.7467v2-abstract-full" style="display: none;"> The dissipative dynamics of a quantum bistable system coupled to a Ohmic heat bath is investigated beyond the spin-boson approximation. Within the path-integral approach to quantum dissipation, we propose an approximation scheme which exploits the separation of time scales between intra- and interwell (tunneling) dynamics. The resulting generalized master equation for the populations in a space localized basis enables us to investigate a wide range of temperatures and system-environment coupling strengths. A phase diagram in the coupling-temperature space is provided to give a comprehensive account of the different dynamical regimes. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.7467v2-abstract-full').style.display = 'none'; document.getElementById('1412.7467v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 December, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 15 figures; second version closer to the published one</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. E 92, 032123 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1412.0094">arXiv:1412.0094</a> <span> [<a href="https://arxiv.org/pdf/1412.0094">pdf</a>, <a href="https://arxiv.org/ps/1412.0094">ps</a>, <a href="https://arxiv.org/format/1412.0094">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.92.174519">10.1103/PhysRevB.92.174519 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Phase dynamics in graphene-based Josephson junctions in the presence of thermal and correlated fluctuations </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1412.0094v1-abstract-short" style="display: inline;"> In this work we study by numerical methods the phase dynamics in ballistic graphene-based short Josephson junctions. The supercurrent through a graphene junction shows a non-sinusoidal phase-dependence, unlike a conventional junction ruled by the well-known d.c. Josephson relation. A superconductor-graphene-superconductor system exhibits superconductive quantum metastable states similar to those p… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.0094v1-abstract-full').style.display = 'inline'; document.getElementById('1412.0094v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1412.0094v1-abstract-full" style="display: none;"> In this work we study by numerical methods the phase dynamics in ballistic graphene-based short Josephson junctions. The supercurrent through a graphene junction shows a non-sinusoidal phase-dependence, unlike a conventional junction ruled by the well-known d.c. Josephson relation. A superconductor-graphene-superconductor system exhibits superconductive quantum metastable states similar to those present in normal current-biased JJs. We explore the effects of thermal and correlated fluctuations on the escape time from these metastable states, when the system is stimulated by an oscillating bias current. As a first step, the analysis is carried out in the presence of an external Gaussian white noise source, which mimics the random fluctuations of the bias current. Varying the noise intensity, it is possible to analyze the behavior of the escape time from a superconductive metastable state in different temperature regimes. Noise induced phenomena, such as resonant activation and noise induced stability, are observed. The study is extended to the case of a coloured Gaussian noise source, analyzing how the escape time from the metastable state is affected by correlated random fluctuations for different values of the noise correlation time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1412.0094v1-abstract-full').style.display = 'none'; document.getElementById('1412.0094v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 8 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1407.2079">arXiv:1407.2079</a> <span> [<a href="https://arxiv.org/pdf/1407.2079">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> </div> <p class="title is-5 mathjax"> Enhancement of the lifetime of metastable states in Er-doped Si nanocrystals by external coloured noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1407.2079v2-abstract-short" style="display: inline;"> The changes in the lifetime of a metastable energy level in Er-doped Si nanocrystals in the presence of an external source of colored noise are analyzed for different values of noise intensity and correlation time. Exciton dynamics is simulated by a set of phenomenological rate equations which take into account all the possible phenomena inherent to the energy states of Si nanocrystals and Er… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.2079v2-abstract-full').style.display = 'inline'; document.getElementById('1407.2079v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1407.2079v2-abstract-full" style="display: none;"> The changes in the lifetime of a metastable energy level in Er-doped Si nanocrystals in the presence of an external source of colored noise are analyzed for different values of noise intensity and correlation time. Exciton dynamics is simulated by a set of phenomenological rate equations which take into account all the possible phenomena inherent to the energy states of Si nanocrystals and Er$^{3+}$ ions in the host material of Si oxide. The electronic deexcitation is studied by examining the decay of the initial population of the Er atoms in the first excitation level $^4$I$_{13/2}$ through the fluorescence and the cooperative upconversion by energy transfer. Our results show that the deexcitation process of the level $^4$I$_{13/2}$ is slowed down within wide ranges of noise intensity and correlation time. Moreover, a nonmonotonic behavior of the lifetime with the amplitude of the fluctuations is found, characterized by a maximum variation for values of the noise correlation time comparable to the deexcitation time. The indirect influence of the colored noise on the efficiency of the energy transfer upconversion activated from the level $^4$I$_{13/2}$ is also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1407.2079v2-abstract-full').style.display = 'none'; document.getElementById('1407.2079v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 July, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.4813">arXiv:1406.4813</a> <span> [<a href="https://arxiv.org/pdf/1406.4813">pdf</a>, <a href="https://arxiv.org/format/1406.4813">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.89.214510">10.1103/PhysRevB.89.214510 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Switching times in long-overlap Josephson junctions subject to thermal fluctuations and non-Gaussian noise sources </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Guarcello%2C+C">Claudio Guarcello</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1406.4813v2-abstract-short" style="display: inline;"> We investigate the superconducting lifetime of long current-biased Josephson junctions, in the presence of Gaussian and non-Gaussian noise sources. In particular, we analyze the dynamics of a Josephson junction as a function of the noise signal intensity, for different values of the parameters of the system and external driving currents. We find that the mean lifetime of the superconductive state… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.4813v2-abstract-full').style.display = 'inline'; document.getElementById('1406.4813v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.4813v2-abstract-full" style="display: none;"> We investigate the superconducting lifetime of long current-biased Josephson junctions, in the presence of Gaussian and non-Gaussian noise sources. In particular, we analyze the dynamics of a Josephson junction as a function of the noise signal intensity, for different values of the parameters of the system and external driving currents. We find that the mean lifetime of the superconductive state is characterized by nonmonotonic behavior as a function of noise intensity, driving frequency and junction length. We observe that these nonmonotonic behaviours are connected with the dynamics of the junction phase string during the switching towards the resistive state. An important role is played by the formation and propagation of solitons, with two different dynamical regimes characterizing the dynamics of the phase string. Our analysis allows to evidence the effects of different bias current densities, that is a simple spatially homogeneous distribution and a more realistic inhomogeneous distribution with high current values at the junction edges. Stochastic resonant activation, noise enhanced stability and temporary trapping phenomena are observed in the system investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.4813v2-abstract-full').style.display = 'none'; document.getElementById('1406.4813v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 October, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 17 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 9 figures, Physical Review B, in press</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1311.7106">arXiv:1311.7106</a> <span> [<a href="https://arxiv.org/pdf/1311.7106">pdf</a>, <a href="https://arxiv.org/format/1311.7106">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1209/0295-5075/104/47011">10.1209/0295-5075/104/47011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Enhancement of electron spin lifetime in GaAs crystals: the benefits of dichotomous noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">Nicola Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1311.7106v2-abstract-short" style="display: inline;"> The electron spin relaxation process in n-type GaAs crystals driven by a fluctuating electric field is investigated. Two different sources of fluctuations are considered: (i) a symmetric dichotomous noise and (ii) a Gaussian correlated noise. Monte Carlo numerical simulations show, in both cases, an enhancement of the spin relaxation time by increasing the amplitude of the external noise. Moreover… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.7106v2-abstract-full').style.display = 'inline'; document.getElementById('1311.7106v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1311.7106v2-abstract-full" style="display: none;"> The electron spin relaxation process in n-type GaAs crystals driven by a fluctuating electric field is investigated. Two different sources of fluctuations are considered: (i) a symmetric dichotomous noise and (ii) a Gaussian correlated noise. Monte Carlo numerical simulations show, in both cases, an enhancement of the spin relaxation time by increasing the amplitude of the external noise. Moreover, we find that the electron spin lifetime versus the noise correlation time: (i) increases up to a plateau in the case of dichotomous random fluctuations, and (ii) shows a nonmonotonic behaviour with a maximum in the case of bulks subjected to a Gaussian correlated noise. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1311.7106v2-abstract-full').style.display = 'none'; document.getElementById('1311.7106v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 November, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 3 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> EPL, 104 (2013) 47011 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1305.0204">arXiv:1305.0204</a> <span> [<a href="https://arxiv.org/pdf/1305.0204">pdf</a>, <a href="https://arxiv.org/ps/1305.0204">ps</a>, <a href="https://arxiv.org/format/1305.0204">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Quantum Physics">quant-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevB.87.214515">10.1103/PhysRevB.87.214515 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Design of a Lambda system for population transfer in superconducting nanocircuits </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Falci%2C+G">G. Falci</a>, <a href="/search/cond-mat?searchtype=author&query=La+Cognata%2C+A">A. La Cognata</a>, <a href="/search/cond-mat?searchtype=author&query=Berritta%2C+M">M. Berritta</a>, <a href="/search/cond-mat?searchtype=author&query=D%27Arrigo%2C+A">A. D'Arrigo</a>, <a href="/search/cond-mat?searchtype=author&query=Paladino%2C+E">E. Paladino</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1305.0204v1-abstract-short" style="display: inline;"> The implementation of a Lambda scheme in superconducting artificial atoms could allow detec- tion of stimulated Raman adiabatic passage (STIRAP) and other quantum manipulations in the microwave regime. However symmetries which on one hand protect the system against decoherence, yield selection rules which may cancel coupling to the pump external drive. The tradeoff between efficient coupling and d… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.0204v1-abstract-full').style.display = 'inline'; document.getElementById('1305.0204v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1305.0204v1-abstract-full" style="display: none;"> The implementation of a Lambda scheme in superconducting artificial atoms could allow detec- tion of stimulated Raman adiabatic passage (STIRAP) and other quantum manipulations in the microwave regime. However symmetries which on one hand protect the system against decoherence, yield selection rules which may cancel coupling to the pump external drive. The tradeoff between efficient coupling and decoherence due to broad-band colored Noise (BBCN), which is often the main source of decoherence is addressed, in the class of nanodevices based on the Cooper pair box (CPB) design. We study transfer efficiency by STIRAP, showing that substantial efficiency is achieved for off-symmetric bias only in the charge-phase regime. We find a number of results uniquely due to non-Markovianity of BBCN, namely: (a) the efficiency for STIRAP depends essentially on noise channels in the trapped subspace; (b) low-frequency fluctuations can be analyzed and represented as fictitious correlated fluctuations of the detunings of the external drives; (c) a simple figure of merit for design and operating prescriptions allowing the observation of STIRAP is proposed. The emerging physical picture also applies to other classes of coherent nanodevices subject to BBCN. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1305.0204v1-abstract-full').style.display = 'none'; document.getElementById('1305.0204v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 11 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1112.0406">arXiv:1112.0406</a> <span> [<a href="https://arxiv.org/pdf/1112.0406">pdf</a>, <a href="https://arxiv.org/ps/1112.0406">ps</a>, <a href="https://arxiv.org/format/1112.0406">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/0953-8984/24/5/052204">10.1088/0953-8984/24/5/052204 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> New insights into electron spin dynamics in the presence of correlated noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">Nicola Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1112.0406v5-abstract-short" style="display: inline;"> The changes of the spin depolarization length in zinc-blende semiconductors when an external component of correlated noise is added to a static driving electric field are analyzed for different values of field strength, noise amplitude and correlation time. Electron dynamics is simulated by a Monte Carlo procedure which keeps into account all the possible scattering phenomena of the hot electrons… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0406v5-abstract-full').style.display = 'inline'; document.getElementById('1112.0406v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1112.0406v5-abstract-full" style="display: none;"> The changes of the spin depolarization length in zinc-blende semiconductors when an external component of correlated noise is added to a static driving electric field are analyzed for different values of field strength, noise amplitude and correlation time. Electron dynamics is simulated by a Monte Carlo procedure which keeps into account all the possible scattering phenomena of the hot electrons in the medium and includes the evolution of spin polarization. Spin depolarization is studied by examinating the decay of the initial spin polarization of the conduction electrons through the D'yakonov-Perel process, the only relevant relaxation mechanism in III-V crystals. Our results show that, for electric field amplitude lower than the Gunn field, the dephasing length shortens with the increasing of the noise intensity. Moreover, a nonmonotonic behavior of spin depolarization length with the noise correlation time is found, characterized by a maximum variation for values of noise correlation time comparable with the dephasing time. Instead, in high field conditions, we find that, critically depending on the noise correlation time, external fluctuations can positively affect the relaxation length. The influence of the inclusion of the electron-electron scattering mechanism is also shown and discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1112.0406v5-abstract-full').style.display = 'none'; document.getElementById('1112.0406v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 2 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Published on "Journal of Physics: Condensed Matter" as "Fast Track Communications", 11 pages, 9 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Condens. Matter 24 (2012) 052204 (6pp) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1105.5716">arXiv:1105.5716</a> <span> [<a href="https://arxiv.org/pdf/1105.5716">pdf</a>, <a href="https://arxiv.org/ps/1105.5716">ps</a>, <a href="https://arxiv.org/format/1105.5716">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Mesoscale and Nanoscale Physics">cond-mat.mes-hall</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2010/11/P11033">10.1088/1742-5468/2010/11/P11033 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Relaxation of Electron Spin during High-Field Transport in GaAs Bulk </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">Nicola Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1105.5716v2-abstract-short" style="display: inline;"> A semiclassical Monte Carlo approach is adopted to study the multivalley spin depolarization of drifting electrons in a doped n-type GaAs bulk semiconductor, in a wide range of lattice temperature ($40<T_L<300$ K) and doping density ($10^{13}<n<10^{16}$cm$^{-3}$). The decay of the initial non-equilibrium spin polarization of the conduction electrons is investigated as a function of the amplitude o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.5716v2-abstract-full').style.display = 'inline'; document.getElementById('1105.5716v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1105.5716v2-abstract-full" style="display: none;"> A semiclassical Monte Carlo approach is adopted to study the multivalley spin depolarization of drifting electrons in a doped n-type GaAs bulk semiconductor, in a wide range of lattice temperature ($40<T_L<300$ K) and doping density ($10^{13}<n<10^{16}$cm$^{-3}$). The decay of the initial non-equilibrium spin polarization of the conduction electrons is investigated as a function of the amplitude of the driving static electric field, ranging between 0.1 and 6 kV/cm, by considering the spin dynamics of electrons in both the $螕$ and the upper valleys of the semiconductor. Doping density considerably affects spin relaxation at low temperature and weak intensity of the driving electric field. At high values of the electric field, the strong spin-orbit coupling of electrons in the $L$-valleys significantly reduces the average spin polarization lifetime, but, unexpectedly, for field amplitudes greater than 2.5 kV/cm, the spin lifetime increases with the lattice temperature. Our numerical findings are validated by a good agreement with the available experimental results and with calculations recently obtained by a different theoretical approach. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1105.5716v2-abstract-full').style.display = 'none'; document.getElementById('1105.5716v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 May, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Stat. Mech. (2010) P11033 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1008.4228">arXiv:1008.4228</a> <span> [<a href="https://arxiv.org/pdf/1008.4228">pdf</a>, <a href="https://arxiv.org/ps/1008.4228">ps</a>, <a href="https://arxiv.org/format/1008.4228">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> </div> <p class="title is-5 mathjax"> Doping dependence of spin dynamics of drifting electrons in GaAs bulks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">Nicola Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1008.4228v6-abstract-short" style="display: inline;"> We study the effect of the impurity density on lifetimes and relaxation lengths of electron spins in the presence of a static electric field in a n-type GaAs bulk. The transport of electrons and the spin dynamics are simulated by using a semiclassical Monte Carlo approach, which takes into account the intravalley scattering mechanisms of warm electrons in the semiconductor material. Spin relaxatio… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.4228v6-abstract-full').style.display = 'inline'; document.getElementById('1008.4228v6-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1008.4228v6-abstract-full" style="display: none;"> We study the effect of the impurity density on lifetimes and relaxation lengths of electron spins in the presence of a static electric field in a n-type GaAs bulk. The transport of electrons and the spin dynamics are simulated by using a semiclassical Monte Carlo approach, which takes into account the intravalley scattering mechanisms of warm electrons in the semiconductor material. Spin relaxation is considered through the D'yakonov-Perel mechanism, which is the dominant mechanism in III-V semiconductors. The evolution of spin polarization is analyzed by computing the lifetimes and depolarization lengths as a function of the doping density in the range 10^{13} - 10^{16} cm^{-3}, for different values of the amplitude of the static electric field (0.1 - 1.0 kV/cm). We find an increase of the electron spin lifetime as a function of the doping density, more evident for lattice temperatures lower than 150 K. Moreover, at very low intensities of the driving field, the spin depolarization length shows a nonmonotonic behaviour with the density. At the room temperature, the spin lifetimes and depolarization lengths are nearly independent on the doping density. The underlying physics is analyzed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1008.4228v6-abstract-full').style.display = 'none'; document.getElementById('1008.4228v6-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2012; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 August, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Acta Physica Polonica A, Vol. 119 No. 2, 250-252 (2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1003.2163">arXiv:1003.2163</a> <span> [<a href="https://arxiv.org/pdf/1003.2163">pdf</a>, <a href="https://arxiv.org/ps/1003.2163">ps</a>, <a href="https://arxiv.org/format/1003.2163">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Other Condensed Matter">cond-mat.other</span> </div> </div> <p class="title is-5 mathjax"> Temperature dependence of spin depolarization of drifting electrons in n-type GaAs bulks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spezia%2C+S">Stefano Spezia</a>, <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">Dominique Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">Nicola Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1003.2163v2-abstract-short" style="display: inline;"> The influence of temperature and transport conditions on the electron spin relaxation in lightly doped n-type GaAs semiconductors is investigated. A Monte Carlo approach is used to simulate electron transport, including the evolution of spin polarization and relaxation, by taking into account intravalley and intervalley scattering phenomena of the hot electrons in the medium. Spin relaxation lengt… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1003.2163v2-abstract-full').style.display = 'inline'; document.getElementById('1003.2163v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1003.2163v2-abstract-full" style="display: none;"> The influence of temperature and transport conditions on the electron spin relaxation in lightly doped n-type GaAs semiconductors is investigated. A Monte Carlo approach is used to simulate electron transport, including the evolution of spin polarization and relaxation, by taking into account intravalley and intervalley scattering phenomena of the hot electrons in the medium. Spin relaxation lengths and times are computed through the D'yakonov-Perel process, which is the more relevant spin relaxation mechanism in the regime of interest (10 < T < 300 K). The decay of the initial spin polarization of the conduction electrons is calculated as a function of the distance in the presence of a static electric field varying in the range 0.1 - 2 kV/cm. We find that the electron spin depolarization lengths and times have a nonmonotonic dependence on both the lattice temperature and the electric field amplitude. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1003.2163v2-abstract-full').style.display = 'none'; document.getElementById('1003.2163v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 December, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 March, 2010; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2010. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Acta Physica Polonica B, Vol. 41, No 5, pages 1171-1180 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0911.5243">arXiv:0911.5243</a> <span> [<a href="https://arxiv.org/pdf/0911.5243">pdf</a>, <a href="https://arxiv.org/ps/0911.5243">ps</a>, <a href="https://arxiv.org/format/0911.5243">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Disordered Systems and Neural Networks">cond-mat.dis-nn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Neurons and Cognition">q-bio.NC</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.81.041911">10.1103/PhysRevE.81.041911 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The spike train statistics for consonant and dissonant musical accords </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Ushakov%2C+Y+V">Yuriy V. Ushakov</a>, <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">Alexander A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0911.5243v1-abstract-short" style="display: inline;"> The simple system composed of three neural-like noisy elements is considered. Two of them (sensory neurons or sensors) are stimulated by noise and periodic signals with different ratio of frequencies, and the third one (interneuron) receives the output of these two sensors and noise. We propose the analytical approach to analysis of Interspike Intervals (ISI) statistics of the spike train genera… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0911.5243v1-abstract-full').style.display = 'inline'; document.getElementById('0911.5243v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0911.5243v1-abstract-full" style="display: none;"> The simple system composed of three neural-like noisy elements is considered. Two of them (sensory neurons or sensors) are stimulated by noise and periodic signals with different ratio of frequencies, and the third one (interneuron) receives the output of these two sensors and noise. We propose the analytical approach to analysis of Interspike Intervals (ISI) statistics of the spike train generated by the interneuron. The ISI distributions of the sensory neurons are considered to be known. The frequencies of the input sinusoidal signals are in ratios, which are usual for music. We show that in the case of small integer ratios (musical consonance) the input pair of sinusoids results in the ISI distribution appropriate for more regular output spike train than in a case of large integer ratios (musical dissonance) of input frequencies. These effects are explained from the viewpoint of the proposed theory. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0911.5243v1-abstract-full').style.display = 'none'; document.getElementById('0911.5243v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 November, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 6 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Physical Review E 81, 041911 (2010) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0908.3292">arXiv:0908.3292</a> <span> [<a href="https://arxiv.org/pdf/0908.3292">pdf</a>, <a href="https://arxiv.org/ps/0908.3292">ps</a>, <a href="https://arxiv.org/format/0908.3292">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.80.041110">10.1103/PhysRevE.80.041110 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Stability measures in metastable states with Gaussian colored noise </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Fiasconaro%2C+A">Alessandro Fiasconaro</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0908.3292v1-abstract-short" style="display: inline;"> We present a study of the escape time from a metastable state of an overdamped Brownian particle, in the presence of colored noise generated by Ornstein-Uhlenbeck process. We analyze the role of the correlation time on the enhancement of the mean first passage time through a potential barrier and on the behavior of the mean growth rate coefficient as a function of the noise intensity. We observe… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.3292v1-abstract-full').style.display = 'inline'; document.getElementById('0908.3292v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0908.3292v1-abstract-full" style="display: none;"> We present a study of the escape time from a metastable state of an overdamped Brownian particle, in the presence of colored noise generated by Ornstein-Uhlenbeck process. We analyze the role of the correlation time on the enhancement of the mean first passage time through a potential barrier and on the behavior of the mean growth rate coefficient as a function of the noise intensity. We observe the noise enhanced stability effect for all the initial unstable states used, and for all values of the correlation time $蟿_c$ investigated. We can distinguish two dynamical regimes characterized by weak and strong correlated noise respectively, depending on the value of $蟿_c$ with respect to the relaxation time of the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0908.3292v1-abstract-full').style.display = 'none'; document.getElementById('0908.3292v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2009; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2009. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 7 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.3154">arXiv:0811.3154</a> <span> [<a href="https://arxiv.org/pdf/0811.3154">pdf</a>, <a href="https://arxiv.org/ps/0811.3154">ps</a>, <a href="https://arxiv.org/format/0811.3154">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjb/e2009-00155-x">10.1140/epjb/e2009-00155-x <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Lifetime of the superconductive state in short and long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Augello%2C+G">Giuseppe Augello</a>, <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Pankratov%2C+A+L">Andrey L. Pankratov</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0811.3154v1-abstract-short" style="display: inline;"> We study the transient statistical properties of short and long Josephson junctions under the influence of thermal and correlated fluctuations. In particular, we investigate the lifetime of the superconductive metastable state finding the presence of noise induced phenomena. For short Josephson junctions we investigate the lifetime as a function both of the frequency of the current driving signa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.3154v1-abstract-full').style.display = 'inline'; document.getElementById('0811.3154v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.3154v1-abstract-full" style="display: none;"> We study the transient statistical properties of short and long Josephson junctions under the influence of thermal and correlated fluctuations. In particular, we investigate the lifetime of the superconductive metastable state finding the presence of noise induced phenomena. For short Josephson junctions we investigate the lifetime as a function both of the frequency of the current driving signal and the noise intensity and we find how these noise-induced effects are modified by the presence of a correlated noise source. For long Josephson junctions we integrate numerically the sine-Gordon equation calculating the lifetime as a function of the length of the junction both for inhomogeneous and homogeneous bias current distributions. We obtain a nonmonotonic behavior of the lifetime as a function of the frequency of the current driving signal and the correlation time of the noise. Moreover we find two maxima in the nonmonotonic behaviour of the mean escape time as a function of the correlated noise intensity. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.3154v1-abstract-full').style.display = 'none'; document.getElementById('0811.3154v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 9 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0811.1945">arXiv:0811.1945</a> <span> [<a href="https://arxiv.org/pdf/0811.1945">pdf</a>, <a href="https://arxiv.org/ps/0811.1945">ps</a>, <a href="https://arxiv.org/format/0811.1945">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.2478/s11534-009-0003-2">10.2478/s11534-009-0003-2 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Stochastic dynamics and mean field approach in a system of three interacting species </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Valenti%2C+D">Davide Valenti</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0811.1945v2-abstract-short" style="display: inline;"> The spatio-temporal dynamics of three interacting species, two preys and one predator, in the presence of two different kinds of noise sources is studied. To describe the spatial distributions of the species we use a model based on Lotka-Volterra equations. A correlated dichotomous noise acts on 尾, the interaction parameter between the two preys, and a multiplicative white noise affects directly… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.1945v2-abstract-full').style.display = 'inline'; document.getElementById('0811.1945v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0811.1945v2-abstract-full" style="display: none;"> The spatio-temporal dynamics of three interacting species, two preys and one predator, in the presence of two different kinds of noise sources is studied. To describe the spatial distributions of the species we use a model based on Lotka-Volterra equations. A correlated dichotomous noise acts on 尾, the interaction parameter between the two preys, and a multiplicative white noise affects directly the dynamics of each one of the three species. We study the time behaviour of the three species in single site for different values of the multiplicative noise intensity, finding noise-induced oscillations of the three species densities with an anticorrelated behaviour of the two preys. Afterwards, by considering a spatially extended system formed by a two-dimensional lattice with N sites and applying a mean field approach, we get the corresponding moment equations in Gaussian approximation. Within this formalism we obtain the time behaviour of the first and second order moments for different values of multiplicative noise intensity, with 尾(t) subject to the same dichotomous noise source. Finally, we compare our results with those obtained by using a coupled map lattice model, consisting of a time discrete version of the Lotka-Volterra equations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0811.1945v2-abstract-full').style.display = 'none'; document.getElementById('0811.1945v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 November, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">21 pages, 7 figures. Submitted to Centr. Eur. J. Phys</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1816">arXiv:0810.1816</a> <span> [<a href="https://arxiv.org/pdf/0810.1816">pdf</a>, <a href="https://arxiv.org/ps/0810.1816">ps</a>, <a href="https://arxiv.org/format/0810.1816">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2009/01/P01002">10.1088/1742-5468/2009/01/P01002 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The problem of analytical calculation of barrier crossing characteristics for Levy flights </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">A. A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=La+Cognata%2C+A">A. La Cognata</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1816v1-abstract-short" style="display: inline;"> By using the backward fractional Fokker-Planck equation we investigate the barrier crossing event in the presence of Levy noise. After shortly review recent results obtained with different approaches on the time characteristics of the barrier crossing, we derive a general differential equation useful to calculate the nonlinear relaxation time. We obtain analytically the nonlinear relaxation time… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1816v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1816v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1816v1-abstract-full" style="display: none;"> By using the backward fractional Fokker-Planck equation we investigate the barrier crossing event in the presence of Levy noise. After shortly review recent results obtained with different approaches on the time characteristics of the barrier crossing, we derive a general differential equation useful to calculate the nonlinear relaxation time. We obtain analytically the nonlinear relaxation time for free Levy flights and a closed expression in quadrature of the same characteristics for cubic potential. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1816v1-abstract-full').style.display = 'none'; document.getElementById('0810.1816v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">12 pages, 2 figures, presented at 5th International Conference on Unsolved Problems on Noise, Lyon, France, 2008, to appear in J. Stat. Mech.: Theory and Experiment</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1699">arXiv:0810.1699</a> <span> [<a href="https://arxiv.org/pdf/0810.1699">pdf</a>, <a href="https://arxiv.org/ps/0810.1699">ps</a>, <a href="https://arxiv.org/format/0810.1699">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2009/01/P01011">10.1088/1742-5468/2009/01/P01011 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Noise driven translocation of short polymers in crowded solutions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">N. Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Fiasconaro%2C+A">A. Fiasconaro</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1699v1-abstract-short" style="display: inline;"> In this work we study the noise induced effects on the dynamics of short polymers crossing a potential barrier, in the presence of a metastable state. An improved version of the Rouse model for a flexible polymer has been adopted to mimic the molecular dynamics by taking into account both the interactions between adjacent monomers and introducing a Lennard-Jones potential between all beads. A be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1699v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1699v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1699v1-abstract-full" style="display: none;"> In this work we study the noise induced effects on the dynamics of short polymers crossing a potential barrier, in the presence of a metastable state. An improved version of the Rouse model for a flexible polymer has been adopted to mimic the molecular dynamics by taking into account both the interactions between adjacent monomers and introducing a Lennard-Jones potential between all beads. A bending recoil torque has also been included in our model. The polymer dynamics is simulated in a two-dimensional domain by numerically solving the Langevin equations of motion with a Gaussian uncorrelated noise. We find a nonmonotonic behaviour of the mean first passage time and the most probable translocation time, of the polymer centre of inertia, as a function of the polymer length at low noise intensity. We show how thermal fluctuations influence the motion of short polymers, by inducing two different regimes of translocation in the molecule transport dynamics. In this context, the role played by the length of the molecule in the translocation time is investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1699v1-abstract-full').style.display = 'none'; document.getElementById('0810.1699v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 3 figures, to appear in J. Stat. Mechanics: Theory and Experiment, 2008</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1695">arXiv:0810.1695</a> <span> [<a href="https://arxiv.org/pdf/0810.1695">pdf</a>, <a href="https://arxiv.org/ps/0810.1695">ps</a>, <a href="https://arxiv.org/format/0810.1695">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-5468/2009/01/P01039">10.1088/1742-5468/2009/01/P01039 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Noise influence on electron dynamics in semiconductors driven by a periodic electric field </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Adorno%2C+D+P">D. Persano Adorno</a>, <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">N. Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1695v1-abstract-short" style="display: inline;"> Studies about the constructive aspects of noise and fluctuations in different non-linear systems have shown that the addition of external noise to systems with an intrinsic noise may result in a less noisy response. Recently, the possibility to reduce the diffusion noise in semiconductor bulk materials by adding a random fluctuating contribution to the driving static electric field has been test… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1695v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1695v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1695v1-abstract-full" style="display: none;"> Studies about the constructive aspects of noise and fluctuations in different non-linear systems have shown that the addition of external noise to systems with an intrinsic noise may result in a less noisy response. Recently, the possibility to reduce the diffusion noise in semiconductor bulk materials by adding a random fluctuating contribution to the driving static electric field has been tested. The present work extends the previous theories by considering the noise-induced effects on the electron transport dynamics in low-doped n-type GaAs samples driven by a high-frequency periodic electric field (cyclostationary conditions). By means of Monte Carlo simulations, we calculate the changes in the spectral density of the electron velocity fluctuations caused by the addition of an external correlated noise source. The results reported in this paper confirm that, under specific conditions, the presence of a fluctuating component added to an oscillating electric field can reduce the total noise power. Furthermore, we find a nonlinear behaviour of the spectral density with the noise intensity. Our study reveals that, critically depending on the external noise correlation time, the dynamical response of electrons driven by a periodic electric field receives a benefit by the constructive interplay between the fluctuating field and the intrinsic noise of the system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1695v1-abstract-full').style.display = 'none'; document.getElementById('0810.1695v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 4 figures, to appear in J. Stat. Mechanics: Theory and Experim., 2008</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1654">arXiv:0810.1654</a> <span> [<a href="https://arxiv.org/pdf/0810.1654">pdf</a>, <a href="https://arxiv.org/ps/0810.1654">ps</a>, <a href="https://arxiv.org/format/0810.1654">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0218127408022068">10.1142/S0218127408022068 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Noise induced phenomena in point Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Gordeeva%2C+A+V">Anna V. Gordeeva</a>, <a href="/search/cond-mat?searchtype=author&query=Pankratov%2C+A+L">Andrey L. Pankratov</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1654v1-abstract-short" style="display: inline;"> We present the analysis of the mean switching time and its standard deviation of short overdamped Josephson junctions, driven by a direct current and a periodic signal. The effect of noise enhanced stability is investigated. It is shown that fluctuations may both decrease and increase the switching time. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1654v1-abstract-full" style="display: none;"> We present the analysis of the mean switching time and its standard deviation of short overdamped Josephson junctions, driven by a direct current and a periodic signal. The effect of noise enhanced stability is investigated. It is shown that fluctuations may both decrease and increase the switching time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1654v1-abstract-full').style.display = 'none'; document.getElementById('0810.1654v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 9 figures, to appear in Int. J. of Bifurcation and Chaos</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Intern. Journ. of Bifurcation and Chaos, Vol. 18, No. 9, 2823 - 2829 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1582">arXiv:0810.1582</a> <span> [<a href="https://arxiv.org/pdf/0810.1582">pdf</a>, <a href="https://arxiv.org/ps/0810.1582">ps</a>, <a href="https://arxiv.org/format/0810.1582">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0218127408022135">10.1142/S0218127408022135 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Noise effects in polymer dynamics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Pizzolato%2C+N">N. Pizzolato</a>, <a href="/search/cond-mat?searchtype=author&query=Fiasconaro%2C+A">A. Fiasconaro</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1582v1-abstract-short" style="display: inline;"> The study of the noise induced effects on the dynamics of a chain molecule crossing a potential barrier, in the presence of a metastable state, is presented. A two-dimensional stochastic version of the Rouse model for a flexible polymer has been adopted to mimic the molecular dynamics and to take into account the interactions between adjacent monomers. We obtain a nonmonotonic behavior of the me… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1582v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1582v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1582v1-abstract-full" style="display: none;"> The study of the noise induced effects on the dynamics of a chain molecule crossing a potential barrier, in the presence of a metastable state, is presented. A two-dimensional stochastic version of the Rouse model for a flexible polymer has been adopted to mimic the molecular dynamics and to take into account the interactions between adjacent monomers. We obtain a nonmonotonic behavior of the mean first passage time and its standard deviation, of the polymer centre of inertia, with the noise intensity. These findings reveal a noise induced effect on the mean crossing time. The role of the polymer length is also investigated. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1582v1-abstract-full').style.display = 'none'; document.getElementById('0810.1582v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures, to appear in Intern. Journ. of Bifurcation and Chaos, 2008</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> I, Vol. 18, No. 9, 2869 - 2874 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1579">arXiv:0810.1579</a> <span> [<a href="https://arxiv.org/pdf/0810.1579">pdf</a>, <a href="https://arxiv.org/ps/0810.1579">ps</a>, <a href="https://arxiv.org/format/0810.1579">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Superconductivity">cond-mat.supr-con</span> </div> </div> <p class="title is-5 mathjax"> Influence of length on the noise delayed switching of long Josephson junctions </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Federov%2C+K+G">K. G. Federov</a>, <a href="/search/cond-mat?searchtype=author&query=Pankratov%2C+A+L">A. L. Pankratov</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1579v1-abstract-short" style="display: inline;"> The transient dynamics of long overlap Josephson junctions in the frame of the sine-Gordon model with a white noise source is investigated. The effect of noise delayed decay is observed for the case of overdamped sine-Gordon equation. It is shown that this noise induced effect, in the range of small noise intensities, vanishes for junctions lengths greater than several Josephson penetration leng… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1579v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1579v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1579v1-abstract-full" style="display: none;"> The transient dynamics of long overlap Josephson junctions in the frame of the sine-Gordon model with a white noise source is investigated. The effect of noise delayed decay is observed for the case of overdamped sine-Gordon equation. It is shown that this noise induced effect, in the range of small noise intensities, vanishes for junctions lengths greater than several Josephson penetration length. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1579v1-abstract-full').style.display = 'none'; document.getElementById('0810.1579v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">7 pages, 9 figures, to appear in Journ. of Bifurcation and Chaos, 2008</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Intern. Journ. of Bifurcation and Chaos, Vol. 18, No. 9, 2855 - 2860 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1492">arXiv:0810.1492</a> <span> [<a href="https://arxiv.org/pdf/0810.1492">pdf</a>, <a href="https://arxiv.org/ps/0810.1492">ps</a>, <a href="https://arxiv.org/format/0810.1492">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/S0218127408021877">10.1142/S0218127408021877 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Levy Flight Superdiffusion: An Introduction </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">A. A. Dubkov</a>, <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">B. Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Uchaikin%2C+V+V">V. V. Uchaikin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1492v1-abstract-short" style="display: inline;"> After a short excursion from discovery of Brownian motion to the Richardson "law of four thirds" in turbulent diffusion, the article introduces the L茅vy flight superdiffusion as a self-similar L茅vy process. The condition of self-similarity converts the infinitely divisible characteristic function of the L茅vy process into a stable characteristic function of the L茅vy motion. The L茅vy motion genera… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1492v1-abstract-full').style.display = 'inline'; document.getElementById('0810.1492v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1492v1-abstract-full" style="display: none;"> After a short excursion from discovery of Brownian motion to the Richardson "law of four thirds" in turbulent diffusion, the article introduces the L茅vy flight superdiffusion as a self-similar L茅vy process. The condition of self-similarity converts the infinitely divisible characteristic function of the L茅vy process into a stable characteristic function of the L茅vy motion. The L茅vy motion generalizes the Brownian motion on the base of the $伪$-stable distributions theory and fractional order derivatives. The further development of the idea lies on the generalization of the Langevin equation with a non-Gaussian white noise source and the use of functional approach. This leads to the Kolmogorov's equation for arbitrary Markovian processes. As particular case we obtain the fractional Fokker-Planck equation for L茅vy flights. Some results concerning stationary probability distributions of L茅vy motion in symmetric smooth monostable potentials, and a general expression to calculate the nonlinear relaxation time in barrier crossing problems are derived. Finally we discuss results on the same characteristics and barrier crossing problems with L茅vy flights, recently obtained with different approaches. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1492v1-abstract-full').style.display = 'none'; document.getElementById('0810.1492v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">32 pages, 9 figures, to appear in Int. J. of Bifurcation and Chaos</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Intern. Journ. of Bifurcation and Chaos, Vol. 18, No. 9, 2649 - 2672 (2008) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.1486">arXiv:0810.1486</a> <span> [<a href="https://arxiv.org/pdf/0810.1486">pdf</a>, <a href="https://arxiv.org/ps/0810.1486">ps</a>, <a href="https://arxiv.org/format/0810.1486">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> </div> </div> <p class="title is-5 mathjax"> Critical Phenomena and Diffusion in Complex Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Spagnolo%2C+B">Bernardo Spagnolo</a>, <a href="/search/cond-mat?searchtype=author&query=Dubkov%2C+A+A">Alexander A. Dubkov</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.1486v1-abstract-short" style="display: inline;"> Editorial of the International Conference on Critical Phenomena and Diffusion in Complex Systems held on 5--7 December, 2006 in Nizhniy Novgorod State University, Russia and was dedicated to the memory and 80th anniversary of Professor Askold N. Malakhov. </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.1486v1-abstract-full" style="display: none;"> Editorial of the International Conference on Critical Phenomena and Diffusion in Complex Systems held on 5--7 December, 2006 in Nizhniy Novgorod State University, Russia and was dedicated to the memory and 80th anniversary of Professor Askold N. Malakhov. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.1486v1-abstract-full').style.display = 'none'; document.getElementById('0810.1486v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, to appear in International Journal of Bifurcation and Chaos</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> International Journal of Bifurcation and Chaos, Vol. 18, No. 9, 2643 - 2647 (2008) </p> </li> </ol> <nav class="pagination is-small is-centered breathe-horizontal" role="navigation" 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