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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
X-WR-CALDESC:
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BEGIN:VEVENT
CLASS:PUBLIC
DTSTART;TZID=Europe/Paris:20220217T110000
DTEND;TZID=Europe/Paris:20220217T120000
DTSTAMP:20220213T213700
UID:MEC-c12706a7c6e8d6476c3d2b6ae0042a82@lps.u-psud.fr
CREATED:20220213
LAST-MODIFIED:20220213
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:J.C. BUDICH: Exceptional Topology of Non-Hermitian Systems
DESCRIPTION:\n         \n\n\n\n	In a broad variety of physical scenarios ranging from classical meta-materials to open quantum systems, non-Hermitian (NH) Hamiltonians have proven to be a powerful and conceptually simple tool for effectively describing dissipation. Motivated by recent experimental discoveries, investigating the topological properties of such NH systems has become a major focus of current research.\n\nI will give an introduction to this rapidly growing field, and present our latest results. Specifically, we discuss the occurrence of novel gapless topological phases unique to NH systems. There, the role of spectral degeneracies familiar from Hermitian systems such as Weyl semimetals is played by exceptional points at which the effective NH Hamiltonian becomes non-diagonalizable.\n\nFurthermore, we show how guiding principles of topological matter such as the bulk-boundary correspondence are qualitatively changed in the NH realm. Finally, we demonstrate that the sensitivity of NH systems to small changes in the boundary conditions may be harnessed to devise novel high-precision sensors.\n\n
URL:https://www.lps.u-psud.fr/events/17022022budich/
ORGANIZER;CN=Andrej Meszaros:MAILTO:
CATEGORIES:Séminaire de la Théorie de la Matière Condensée
LOCATION:Zoom (Online)
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