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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/2306.11388">arXiv:2306.11388</a> <span> [<a href="https://arxiv.org/pdf/2306.11388">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> </div> </div> <p class="title is-5 mathjax"> Optimizing the Ullmann coupling reaction efficiency on an oxide surface by metal atom addition </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Abadia%2C+M">Mikel Abadia</a>, <a href="/search/physics?searchtype=author&query=Piquero-Zulaica%2C+I">Ignacio Piquero-Zulaica</a>, <a href="/search/physics?searchtype=author&query=Brede%2C+J">Jens Brede</a>, <a href="/search/physics?searchtype=author&query=Verdini%2C+A">Alberto Verdini</a>, <a href="/search/physics?searchtype=author&query=Floreano%2C+L">Luca Floreano</a>, <a href="/search/physics?searchtype=author&query=Barth%2C+J+V">Johannes V. Barth</a>, <a href="/search/physics?searchtype=author&query=Lobo-Checa%2C+J">Jorge Lobo-Checa</a>, <a href="/search/physics?searchtype=author&query=Corso%2C+M">Martina Corso</a>, <a href="/search/physics?searchtype=author&query=Rogero%2C+C">Celia Rogero</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="2306.11388v1-abstract-short" style="display: inline;"> The bottom-up synthesis of carbon based nanomaterials directly on semiconductor surfaces allows to decouple their electronic and magnetic properties from the substrates. However, the lack of reactivity on these non-metallic surfaces hinders or reduces significantly the yield of these reactions. Such hurdles practically precludes transferring bottom-up synthesis strategies onto semiconducting and i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.11388v1-abstract-full').style.display = 'inline'; document.getElementById('2306.11388v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.11388v1-abstract-full" style="display: none;"> The bottom-up synthesis of carbon based nanomaterials directly on semiconductor surfaces allows to decouple their electronic and magnetic properties from the substrates. However, the lack of reactivity on these non-metallic surfaces hinders or reduces significantly the yield of these reactions. Such hurdles practically precludes transferring bottom-up synthesis strategies onto semiconducting and insulating surfaces. Here, we achieve a high polymerization yield of terphenyl molecules on the semiconductor TiO$_2$(110) surface by incorporating cobalt atoms as catalysts in the Ullmann coupling reaction. Cobalt atoms trigger the debromination of 4,4-dibromo-p-terphenyl (DBTP) molecules on TiO$_2$(110) and the formation of an intermediate organometallic phase already at room-temperature (RT). As the debromination temperature is drastically reduced, the homo-coupling temperature is also significantly lowered, preventing the desorption of DBTP molecules from the TiO$_2$(110) surface and leading to a radical improvement on the poly-para-phenylene (PPP) polymerization yield. The universality of this mechanism is demonstrated with an iodinated terphenyl derivative (DITP), which shows analogous dehalogenation and polymerization temperatures with a very similar reaction yield. Consequently, we propose to use minute amounts of metal catalyst to drive forward generic bottom-up synthesis strategies on non-metallic surfaces. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.11388v1-abstract-full').style.display = 'none'; document.getElementById('2306.11388v1-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 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.10141">arXiv:2107.10141</a> <span> [<a href="https://arxiv.org/pdf/2107.10141">pdf</a>, <a href="https://arxiv.org/format/2107.10141">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="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</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/RevModPhys.94.045008">10.1103/RevModPhys.94.045008 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Engineering interfacial quantum states and electronic landscapes by molecular nanoarchitectures </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Piquero-Zulaica%2C+I">Ignacio Piquero-Zulaica</a>, <a href="/search/physics?searchtype=author&query=Lobo-Checa%2C+J">Jorge Lobo-Checa</a>, <a href="/search/physics?searchtype=author&query=El-Fattah%2C+Z+M+A">Zakaria M. Abd El-Fattah</a>, <a href="/search/physics?searchtype=author&query=Ortega%2C+J+E">J. Enrique Ortega</a>, <a href="/search/physics?searchtype=author&query=Klappenberger%2C+F">Florian Klappenberger</a>, <a href="/search/physics?searchtype=author&query=Auw%C3%A4rter%2C+W">Willi Auw盲rter</a>, <a href="/search/physics?searchtype=author&query=Barth%2C+J+V">Johannes V. Barth</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="2107.10141v1-abstract-short" style="display: inline;"> Surfaces are at the frontier of every known solid. They provide versatile supports for functional nanostructures and mediate essential physicochemical processes. Being intimately related with 2D materials, interfaces and atomically thin films often feature distinct electronic states with respect to the bulk, which are key for many relevant properties, such as catalytic activity, interfacial charge… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10141v1-abstract-full').style.display = 'inline'; document.getElementById('2107.10141v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.10141v1-abstract-full" style="display: none;"> Surfaces are at the frontier of every known solid. They provide versatile supports for functional nanostructures and mediate essential physicochemical processes. Being intimately related with 2D materials, interfaces and atomically thin films often feature distinct electronic states with respect to the bulk, which are key for many relevant properties, such as catalytic activity, interfacial charge-transfer, or crystal growth mechanisms. Of particular interest is reducing the surface electrons' dimensionality and spread with atomic precision, to induce novel quantum properties via lateral scattering and confinement. Both atomic manipulation and supramolecular principles provide access to custom-designed molecular superlattices, which tailor the surface electronic landscape and influence fundamental chemical and physical properties at the nanoscale. Herein, we review the confinement of surface state electrons focusing on their interaction with molecule-based scaffolds created by molecular manipulation and self-assembly protocols under ultrahigh vacuum conditions. Starting from the quasi-free 2D electron gas present at the (111)-terminated surface planes of noble metals, we illustrate the enhanced molecule-based structural complexity and versatility compared to simple atoms. We survey low-dimensional confining structures in the form of artificial lattices, molecular nanogratings or quantum dot arrays, which are constructed upon appropriate choice of their building constituents. Whenever the realized (metal-)organic networks exhibit long-range order, modified surface band structures with characteristic features emerge, revealing intriguing physical properties, such as discretization, quantum coupling or energy and effective mass renormalization. Such collective electronic states can be additionally modified by positioning guest species at the voids of open nanoarchitectures [...]. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.10141v1-abstract-full').style.display = 'none'; document.getElementById('2107.10141v1-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> 21 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </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">Review with 31 pages and 28 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/1910.06876">arXiv:1910.06876</a> <span> [<a href="https://arxiv.org/pdf/1910.06876">pdf</a>, <a href="https://arxiv.org/format/1910.06876">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-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="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/10.1039/C9NR07365E">10.1039/C9NR07365E <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Tunable energy and mass renormalization from homothetic Quantum dot arrays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Li%2C+I+P+J">Ignacio Piquero-Zulaica Jun Li</a>, <a href="/search/physics?searchtype=author&query=El-Fattah%2C+Z+M+A">Zakaria M. Abd El-Fattah</a>, <a href="/search/physics?searchtype=author&query=Solianyk%2C+L">Leonid Solianyk</a>, <a href="/search/physics?searchtype=author&query=Gallardo%2C+I">Iker Gallardo</a>, <a href="/search/physics?searchtype=author&query=Monjas%2C+L">Leticia Monjas</a>, <a href="/search/physics?searchtype=author&query=Hirsch%2C+A+K+H">Anna K. H. Hirsch</a>, <a href="/search/physics?searchtype=author&query=Arnau%2C+A">Andres Arnau</a>, <a href="/search/physics?searchtype=author&query=Ortega%2C+J+E">J. Enrique Ortega</a>, <a href="/search/physics?searchtype=author&query=Stohr%2C+M">Meike Stohr</a>, <a href="/search/physics?searchtype=author&query=Lobo-Checa%2C+J">Jorge Lobo-Checa</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="1910.06876v1-abstract-short" style="display: inline;"> Quantum dot arrays in the form of molecular nanoporous networks are renown for modifying the electronic surface properties through quantum confinement. Here we show that, compared to the pristine surface state, the fundamental energy of the confined states can exhibit downward shifts accompanied by a lowering of the effective masses simultaneous to the appearance of tiny gaps at the Brillouin zone… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.06876v1-abstract-full').style.display = 'inline'; document.getElementById('1910.06876v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.06876v1-abstract-full" style="display: none;"> Quantum dot arrays in the form of molecular nanoporous networks are renown for modifying the electronic surface properties through quantum confinement. Here we show that, compared to the pristine surface state, the fundamental energy of the confined states can exhibit downward shifts accompanied by a lowering of the effective masses simultaneous to the appearance of tiny gaps at the Brillouin zone boundaries. We observed these effects by angle resolved photoemission for two self-assembled homothetic (scalable) Co-coordinated metal-organic networks. Complementary scanning tunneling spectroscopy measurements confirmed these findings. Electron plane wave expansion simulations and density functional theory calculations provide insight into the nature of this phenomenon, which we assign to metal-organic overlayer-substrate interactions in the form of adatom-substrate hybridization. The absence to date of the experimental band structure resulting from single adatom metal-coordinated nanoporous networks has precluded the observation of the significant surface state renormalization reported here, which we infer are general of low interacting and well-defined adatom arrays. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.06876v1-abstract-full').style.display = 'none'; document.getElementById('1910.06876v1-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> 15 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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">3 figures and main text SI missing</span> </p> </li> </ol> <div class="is-hidden-tablet">  <span 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