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SUMMARY:Topological Semimetals: Where the Massless Fermions Are
DTSTART;VALUE=DATE:20171020
DTSTAMP:20260506T084452Z
UID:0291b96ddd9f3eea00d916ce4fd4693333c1dfad50858683719ced57
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Hongming Weng\, Institute of Physics\, Chinese Academy o
 f Sciences & Collaborative Innovation Center of Quantum Matter\, Beijing\
 , China\nTopological semimetals (TSMs)\, characterized by Weyl/Dirac nodes
  in the bulk and Fermi arcs on their surfaces\, are new states of three-di
 mensional quantum matters. They represent the extension of the topological
  classification of matters from insulator to metal. The low energy excitat
 ion in Dirac/Weyl semimetals (WSM) behaves in the similar way as the massl
 ess Dirac/Weyl fermions described by Dirac/Weyl equation. The Weyl fermion
 s have certain chirality and have not been discovered since Hermann Weyl p
 roposed them more than 80 years ago. The recent discovery of their quasipa
 rticles in solids has inspired broad and intensive studies in the field of
  TSMs. Notably\, the Lorentz invariance assumed in high-energy field theor
 y is broken in solids\, which leads to more unconventional quasiparticles 
 beyond the traditional classification of fermions of Dirac\, Weyl and Majo
 rana. This greatly enriches the quantum states of TSM family\, including N
 ode-line semimetal\, type-II WSM\, multiple-degenerate nodal point semimet
 al\, etc. In this talk\, I will briefly introduce the band topology theory
  firstly\, and then show how to extend the topology of electronic states d
 efined on the manifold of whole Brillouin zone in insulators to that defin
 ed on closed Fermi surface of partial Brillouin zone. Finally\, our theore
 tical predictions of realistic materials to host these intriguing quantum 
 states\, as well as their experimental progresses\, are talked about. The 
 TSM family members and their relationship with each other are discussed an
 d summarized.
LOCATION:
STATUS:CONFIRMED
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