Quantum Science Colloquium - Niels Asger Mortensen, Syddansk Universitet: Mesoscopic electrodynamics at metal surfaces: quantum and nonlocal effects
Oplysninger om arrangementet
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  and potential applications in emerging light-based quantum technologies . 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.
The colloquium will address three cases, where mesoscopic electrodynamic effects matter: 1) plasmon-emitter interactions , electronic surface states in crystalline materials , and plasmon-polariton interactions in graphene-on-metal structures . Finally, prospects for probing electrodynamics of correlated electron materials are discussed .
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 P.A.D. Gonçalves et al., ”Plasmon-Emitter Interactions at the Nanoscale”,
Nat. Commun. 11, 366 (2020)
 P.A.D. Gonçalves et al., Quantum Surface-Response of Metals Revealed by Acoustic Graphene Plasmons", Nat. Commun. 12, 3271 (2021)
 A.T. Costa et al., "Harnessing Ultra-confined Graphene Plasmons to Probe the Electrodynamics of Superconductors", PNAS 118, e2012847118 (2021)