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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20261015T110000
DTEND;TZID=Europe/Paris:20261015T180000
DTSTAMP:20261008T142100
UID:MEC-7f489f642a0ddb10272b5c31057f0663@lps.u-psud.fr
CREATED:20261008
LAST-MODIFIED:20261008
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:William Faugno : Topology in the Many-Body Spectrum: A Spectral Localizer Approach to Quantum Scars
DESCRIPTION:\nQuantum many-body scars are a striking form of nonthermal behavior in interacting quantum systems, in which atypical highly excited eigenstates violate the eigenstate thermalization hypothesis and can support long-lived coherent dynamics. While there has been substantial progress in understand the origins of QMBS, a general framework for identifying and characterizing such states remains elusive. Topology provides a powerful framework for identifying robust structure in quantum systems, but its application to many-body systems has traditionally focused on gapped ground states, in part because conventional many-body topological invariants require a well-defined spectral gap. Recently, the spectral localizer has provided a powerful approach to characterizing topology and topological protection in single-particle systems without requiring a spectral gap. In this talk, I will review the single-particle spectral localizer and present an extension to interacting many-body systems that allows us to probe topological structure deep in the many-body spectrum. The states identified by this approach exhibit anomalously low entanglement entropy, violate the eigenstate thermalization hypothesis, and support nonthermal dynamics. We therefore propose a connection between the topological structure revealed by the spectral localizer and quantum many-body scars, and identify these states as candidate prethermal scars.\n
URL:https://www.lps.u-psud.fr/en/events/william-faugno-topology-in-the-many-body-spectrum-a-spectral-localizer-approach-to-quantum-scars/
CATEGORIES:Condensed Matter Theory Seminar,Seminars
ATTACH;FMTTYPE=image/png:https://www.lps.u-psud.fr/wp-content/uploads/2026/10/Trombi_FAUGNO-William.png
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