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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <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/2107.08659">arXiv:2107.08659</a> <span> [<a href="https://arxiv.org/pdf/2107.08659">pdf</a>, <a href="https://arxiv.org/format/2107.08659">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1016/j.carbon.2021.10.048">10.1016/j.carbon.2021.10.048 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Origin of the Background Absorption in Carbon Nanotubes: Phonon-Assisted Excitonic Continuum </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Forno%2C+S+D">Stefano Dal Forno</a>, <a href="/search/cond-mat?searchtype=author&query=Komatsu%2C+N">Natsumi Komatsu</a>, <a href="/search/cond-mat?searchtype=author&query=Wais%2C+M">Michael Wais</a>, <a href="/search/cond-mat?searchtype=author&query=Mojibpour%2C+A">Ali Mojibpour</a>, <a href="/search/cond-mat?searchtype=author&query=Wadgaonkar%2C+I">Indrajit Wadgaonkar</a>, <a href="/search/cond-mat?searchtype=author&query=Ghosh%2C+S">Saunab Ghosh</a>, <a href="/search/cond-mat?searchtype=author&query=Yomogida%2C+Y">Yohei Yomogida</a>, <a href="/search/cond-mat?searchtype=author&query=Yanagi%2C+K">Kazuhiro Yanagi</a>, <a href="/search/cond-mat?searchtype=author&query=Held%2C+K">Karsten Held</a>, <a href="/search/cond-mat?searchtype=author&query=Kono%2C+J">Junichiro Kono</a>, <a href="/search/cond-mat?searchtype=author&query=Battiato%2C+M">Marco Battiato</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="2107.08659v1-abstract-short" style="display: inline;"> Excitonic effects in 1D semiconductors can be qualitatively different from those in higher dimensions. In particular, the Sommerfeld factor, the ratio of the above-band-edge excitonic continuum absorption to free electron-hole pair generation, has been shown to be less than 1 (i.e., suppressed) in 1D systems while it is larger than1 (i.e., enhanced) in 2D and 3D systems. Strong continuum suppressi… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08659v1-abstract-full').style.display = 'inline'; document.getElementById('2107.08659v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.08659v1-abstract-full" style="display: none;"> Excitonic effects in 1D semiconductors can be qualitatively different from those in higher dimensions. In particular, the Sommerfeld factor, the ratio of the above-band-edge excitonic continuum absorption to free electron-hole pair generation, has been shown to be less than 1 (i.e., suppressed) in 1D systems while it is larger than1 (i.e., enhanced) in 2D and 3D systems. Strong continuum suppression indeed exists in semiconducting single-wall carbon nanotubes, a prototypical 1D semiconductor. However, absorption spectra for carbon nanotubes are typically fit with a combination of Lorentzians and a polynomial background baseline with little physical meaning. Here, we performed absorption measurements in aligned single-chirality (6,5) carbon nanotube films. The obtained spectra were fit with our theoretical model obtained by solving the Boltzmann scattering equation (i.e., the quantum Fokker-Planck equation), involving fifty-nine different types of transitions among three different types of quasiparticles. Specifically, we took into account microscopic interactions between photons, phonons, and excitons, including their dispersions, which unambiguously demonstrated that the background absorption is due to phonon-assisted transitions from the semiconductor vacuum to finite-momentum continuum states of excitons. The excellent agreement we obtained between experiment and theory suggests that our numerical technique can be seamlessly extended to compute strongly out-of-equilibrium many-body dynamics and time-resolved spectra in low-dimensional materials. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.08659v1-abstract-full').style.display = 'none'; document.getElementById('2107.08659v1-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 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2010.03352">arXiv:2010.03352</a> <span> [<a href="https://arxiv.org/pdf/2010.03352">pdf</a>, <a href="https://arxiv.org/format/2010.03352">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</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/10.1016/j.cpc.2021.107863">10.1016/j.cpc.2021.107863 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Numerical scheme for the far-out-of-equilibrium time-dependent Boltzmann collision operator: 1D second-degree momentum discretisation and adaptive time stepping </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wadgaonkar%2C+I">Indrajit Wadgaonkar</a>, <a href="/search/cond-mat?searchtype=author&query=Jain%2C+R">Rishabh Jain</a>, <a href="/search/cond-mat?searchtype=author&query=Battiato%2C+M">Marco Battiato</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="2010.03352v1-abstract-short" style="display: inline;"> Study of far-from-equilibrium thermalization dynamics in quantum materials, including the dynamics of different types of quasiparticles, is becoming increasingly crucial. However, the inherent complexity of either the full quantum mechanical treatment or the solution of the scattering integral in the Boltzmann approach, has significantly limited the progress in this domain. In our previous work we… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.03352v1-abstract-full').style.display = 'inline'; document.getElementById('2010.03352v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2010.03352v1-abstract-full" style="display: none;"> Study of far-from-equilibrium thermalization dynamics in quantum materials, including the dynamics of different types of quasiparticles, is becoming increasingly crucial. However, the inherent complexity of either the full quantum mechanical treatment or the solution of the scattering integral in the Boltzmann approach, has significantly limited the progress in this domain. In our previous work we had developed a solver to calculate the scattering integral in the Boltzmann equation. The solver is free of any approximation (no linearisation of the scattering operator, no close-to-equilibrium approximation, full non-analytic dispersions, full account of Pauli factors, and no limit to low order scattering) \cite{Michael}. Here we extend it to achieve a higher order momentum space convergence by extending to second degree basis functions.cWe further use an adaptive time stepper, achieving a significant improvement in the numerical performance. Moreover we show adaptive time stepping can prevent intrinsic instabilities in the time propagation of the Boltzmann scattering operator. This work makes the numerical time propagation of the full Boltzmann scattering operator efficient, stable and minimally reliant on human supervision. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2010.03352v1-abstract-full').style.display = 'none'; document.getElementById('2010.03352v1-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 October, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1609.08378">arXiv:1609.08378</a> <span> [<a href="https://arxiv.org/pdf/1609.08378">pdf</a>, <a href="https://arxiv.org/ps/1609.08378">ps</a>, <a href="https://arxiv.org/format/1609.08378">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link 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="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/10.1063/1.4975691">10.1063/1.4975691 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Network formation and gelation in Telechelic star polymers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/cond-mat?searchtype=author&query=Wadgaonkar%2C+I">Indrajit Wadgaonkar</a>, <a href="/search/cond-mat?searchtype=author&query=Chatterji%2C+A">Apratim Chatterji</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="1609.08378v1-abstract-short" style="display: inline;"> We investigate the efficiency of gelation and network formation in telechelic star polymer melt, where the tips of polymer arms are dipoles while rest of the monomers are uncharged. Our work is motivated by the experimental observations [A.Kulkarni et.al, Macromolecules, {\bf 48}, 6580 (2015)], in which rheological studies of telechelic star polymers of poly-(L-actide), a bio-degradable polymer, s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08378v1-abstract-full').style.display = 'inline'; document.getElementById('1609.08378v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1609.08378v1-abstract-full" style="display: none;"> We investigate the efficiency of gelation and network formation in telechelic star polymer melt, where the tips of polymer arms are dipoles while rest of the monomers are uncharged. Our work is motivated by the experimental observations [A.Kulkarni et.al, Macromolecules, {\bf 48}, 6580 (2015)], in which rheological studies of telechelic star polymers of poly-(L-actide), a bio-degradable polymer, showed a drastic increase in elastic properties (up to $2000$ times) compared to corresponding star polymers without the telechelic arm ends. In contrast to previous studies, we avoid using effective attractive Lennard Jones potentials or dipolar potentials to model telechelic interactions. Instead we use explicit Coulomb positive and negative charges at the tip of polymer-arms of our bead-spring model of star polymers. By our simulations we show that the dipoles at the tip of star arms aggregate together to form clusters of dipoles. Each cluster has contribution from several stars, and in turn each star contributes to several clusters. Thus the entire polymer melt forms a connected network. Network forming tendencies decrease with decrease of the value of the effective charge constituting the dipole: this can be experimentally realized by choosing a different ionomer for the star tip. We systematically varied the value of dipole charges, the fraction of star-arms with dipoles at the tip and the length of the arms. The choice of explicit charges in our calculations enables us to make better quantitative predictions about the onset of gelation, moreover we get qualitatively distinct results about structural organization of dipoles within a dipole-cluster. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1609.08378v1-abstract-full').style.display = 'none'; document.getElementById('1609.08378v1-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 September, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2016. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" 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