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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20250306T110000
DTEND;TZID=Europe/Paris:20250306T120000
DTSTAMP:20250228T092900
UID:MEC-e10534dd65cf727692c0f9c44ba613f8@lps.u-psud.fr
CREATED:20250228
LAST-MODIFIED:20250228
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Mircea TRIF : Non-Hermitian Fermi-Dirac distribution in persistent current transport
DESCRIPTION:\nMircea TRIF, International Research Centre MagTop, Polish Academy of Sciences, Warsaw, Poland\n\n\n\nLe résumé :I will introduce a theoretical framework for describing the persistent current transport in non-Hermitian quantum systems, building on the foundation of Hermitian superconducting-normal-superconducting junctions. To incorporate dissipation, I will employ a Green’s function formalism and show the emergence of a non-Hermitian Fermi-Dirac distribution that allows deriving an analytical expression for the persistent current solely in terms of the complex spectrum.This formula is applied to two dissipative models: (i) a phase-biased superconducting-normal-superconducting junction, and (ii) a normal mesoscopic ring threaded by a magnetic flux. I will demonstrate that the persistent currents in both systems exhibit no anomalies at emergent exceptional points, whose signatures instead become apparent in the current-current susceptibility — a dynamical quantity. These results, validated by exact diagonalization, are further extended to include finite temperature and interaction effects.I will conclude by discussing potential applications of this formalism in designing non-Hermitian devices, such as superconducting diodes, and for exploring non-equilibrium quantum transport.\n\n\n\nReference:\n\n\n\nP.-X. Shen, Z. Lu, J. L. Lado, and M. Trif, Non-Hermitian Fermi-Dirac Distribution in Persistent Current Transport, Phys. Rev. Lett. 133, 086301 (2024).\n\n\n\nContact: andrej.mesaros@universite-paris-saclay.fr ( mailto:andrej.meszaros@universite-paris-saclay.fr )\n\n\n\n\n
URL:https://www.lps.u-psud.fr/events/mircea-trif-non-hermitian-fermi-dirac-distribution-in-persistent-current-transport/
CATEGORIES:Séminaire de la Théorie de la Matière Condensée,Séminaires
LOCATION:Moyen amphi (LPS) + ONLINE (Zoom)
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