Topological classification of crystalline insulators through band structure combinatorics

Datum

26.01.2017

Zeit

14:00 - 15:00

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Jorrit Kruthoff (University of Amsterdam)

Beschreibung

In this talk I will discuss the classification of topological phases protected by a space group symmetry in the absence of time-reversal and particle-hole symmetry. The space group symmetries cause the bands to arrange themselves in a systematic way along the Brillouin zone. I will exploit this systematic arrangement to come up with a method that classifies all topological phases protected by space group symmetry only. To illustrate the method I will discuss a particular example in two dimensions. A further application of our method allows us to study the transitions between these topological phases. I will argue that in two dimensions there can be direct transitions, but also intermediate semi-metallic phases that host Weyl nodes.

Letztmalig verändert: 26.01.2017, 08:37:35