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math-ph2016
Noncommutative topological invariant
Ralph M. Kaufmann, Dan Li, Birgit Wehefritz-Kaufmann
We generalize the invariant of topological insulators using noncommutative differential geometry in two different ways. First, we model Majorana zero modes by KQ-cyc…
math-ph2016
The Stiefel--Whitney theory of topological insulators
Ralph M. Kaufmann, Dan Li, Birgit Wehefritz-Kaufmann
We study the topological band theory of time reversal invariant topological insulators and interpret the topological invariant as an obstruction in terms of Stiefel-…