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SUMMARY:Anton Kapustin (Caltech)
DTSTART:20220222T193000Z
DTEND:20220222T203000Z
DTSTAMP:20260423T024511Z
UID:nhetc/29
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/nhetc/29/">E
 quivariant Berry phase for many-body quantum lattice systems</a>\nby Anton
  Kapustin (Caltech) as part of NHETC Seminar\n\n\nAbstract\nBerry phase as
  originally defined makes sense only for quantum systems with a finite-dim
 ensional Hilbert space. However\, it does have important generalizations t
 o many-body systems. In this talk I will describe some generalizations of 
 the Berry phase to the case of quantum lattice systems in infinite volume.
  The Hall conductance and its nonabelian versions emerge as special cases.
  The results can be viewed as a generalizations of the von Neumann - Wigne
 r theorem on level crossing in quantum systems.\n
LOCATION:https://researchseminars.org/talk/nhetc/29/
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