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A geometric construction of topological invariants for crystals with time-reversal symmetry
  Condensed Matter seminars

Wednesday 13 September 2017
from 15:30 to 16:30
at Nordita South
Speaker : Krzysztof Gawedzki (ENS de Lyon)
Abstract : I shall discuss a construction of Z_2-valued invariants of topological phases for 2d and 3d time-reversal symmetric crystals, both static and periodically driven. The construction uses a geometric structure (a gerbe) on U(N) that encodes ambiguities of the logarithm of a unitary matrix.

Nordita  | Last modified 28 August 2017 17:37  |  HELP