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						<h1 itemprop="headline">Quantum Science Colloquium - Niels Asger Mortensen, Syddansk Universitet: Mesoscopic electrodynamics at metal surfaces: quantum and nonlocal effects</h1>
						
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														Torsdag  2. december 2021,
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														&nbsp;kl. 15:00 -  16:00
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									<p>Abstract:&nbsp;<br> <br> Plasmonic phenomena in metals are commonly explored within the framework of classical electrodynamics and semiclassical models for the interactions of light with free-electron matter. The more detailed understanding of mesoscopic electrodynamics at metal surfaces is, however, becoming increasingly important for both fundamental developments in quantum plasmonics [1] and potential applications in emerging light-based quantum technologies [2]. While this intuitively calls for a full quantum description of plasmon-enhanced light-matter interactions, recent discoveries suggest how classical electrodynamics may still suffice if appropriately dressed by quantum-corrected mesoscopic boundary conditions – surface-response formalism.</p>
<p>The colloquium will address three cases, where mesoscopic electrodynamic effects matter: 1) plasmon-emitter interactions [4], electronic surface states in crystalline materials [5], and plasmon-polariton interactions in graphene-on-metal structures [6]. Finally, prospects for probing electrodynamics of correlated electron materials are discussed [7].<br> <br> [1] N.A. Mortensen, “Mesoscopic electrodynamics at metal surfaces – From quantum-corrected hydrodynamics to microscopic surface-response formalism”, <a href="http://doi.org/10.1515/nanoph-2021-0156" target="_self">Nanophotonics <strong>10</strong>, 2563 (2021)</a></p>
<p>[2] A.I. Fernández-Domínguez, S.I. Bozhevolnyi &amp; N.A. Mortensen, “Plasmon-enhanced generation of non-classical light”, <a href="http://dx.doi.org/10.1021/acsphotonics.8b00852" target="_self">ACS Photonics <strong>5</strong>, 3447 (2018)</a>.</p>
<p>[4] P.A.D. Gonçalves <em>et al.</em>, ”Plasmon-Emitter Interactions at the Nanoscale”,<br> <a href="https://doi.org/10.1038/s41467-019-13820-z" target="_self">Nat. Commun. <strong>11</strong>, 366 (2020)</a><span class="MsoHyperlink">.</span></p>
<p><span class="MsoHyperlink">[5] A.R. Echarri <em>et al.</em>, "Optical response of noble metal nanostructures: Quantum surface effects in crystallographic facets", </span><a href="https://doi.org/10.1364/OPTICA.412122" target="_self">Optica <strong>8</strong>, 710 (2021)</a></p>
<p>[6] P.A.D. Gonçalves <em>et al.</em>, Quantum Surface-Response of Metals Revealed by Acoustic Graphene Plasmons", <a href="https://dx.doi.org/10.1038/s41467-021-23061-8" target="_self">Nat. Commun. <strong>12</strong>, 3271 (2021)</a></p>
<p>[7] A.T. Costa <em>et al.</em>, "Harnessing Ultra-confined Graphene Plasmons to Probe the Electrodynamics of Superconductors", <a href="https://doi.org/10.1073/pnas.2012847118" target="_blank" rel="noreferrer">PNAS&nbsp;<strong>118</strong>, e2012847118 (2021)</a></p>
								
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