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UID:DSC-21834
DTSTART;TZID=Europe/Berlin:20250325T110000
SEQUENCE:1742884810
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20250325T120000
URL:https://www.dresden-science-calendar.de/calendar/en/detail/21834
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Varjas: Isotropic amorphous topological phases
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Daniel Varjas\nInstitute of Speaker: University of
  Budapest\, IFW Dresden\nTopics:\n\n Location:\n  Name: IFW (D2E.27\, IFW 
 Dresden)\n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \
 n  Fax: \nDescription: . Topological phases of matter are distinguished by
  robust properties that are insensitive to perturbations. These include qu
 antized responses\, perfectly conducting interfaces\, and exactly zero ene
 rgy modes\, with wide-ranging technological applications. Recent years saw
  the complete classification of topological band structures\, revealing an
  abundance of topological crystalline insulators. Many questions about the
  robustness of these phases to disorder are\, however\, still open. We dev
 elop new theoretical and numerical methods based on local topological mark
 ers and effective momentum-space Hamiltonians to study topological phases 
 in disordered systems. We introduce the topological Weaire-Thorpe class of
  models\, whose short-range properties allow us to analytically predict sp
 ectral gaps and topological phase diagrams\, which determine quantized obs
 ervables like circular dichroism\, by introducing symmetry indicators for 
 the first time in an amorphous system. We also  demonstrate that it is pos
 sible to construct a fully isotropic and inversion-symmetric three-dimensi
 onal medium where time-reversal symmetry is systematically broken. We prop
 ose an amorphous system with scalar time-reversal symmetry breaking\, impl
 emented by hopping through chiral magnetic clusters along the bonds. The a
 verage spatial symmetries alone protect a statistical topological insulato
 r phase in this system\, analogous to crystalline mirror Chern insulators.
  We also show the expected transport properties of a three-dimensional sta
 tistical topological insulator\, which remains critical on the surface for
  odd values of the invariant. .
DTSTAMP:20260510T041130Z
CREATED:20250322T063639Z
LAST-MODIFIED:20250325T064010Z
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