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Topological Insulators Stabilized by Point Group Symmetry

Speaker: 
Bogdan A. Bernevig (Department of Physics, Princeton University, USA)
Date: 
Mon, 13/05/2013 - 11:00am to 12:00pm
Location: 
S13-M01-11 (Physics Conference Room)
Host: 
Vitor M. Pereira
Event Type: 
Seminars

Abstract

A complete classification of non-interacting topological insulators with time-reversal and charge conjugation symmetry is known. It contains many cases in which no topological class can be defined - for example classes with spineless time-reversal symmetry. We show that the introduction of point-group symmetry provides a grading which gives rise to many new topological classes which are outside the regular table of topological insulators. Simple examples are topological insulators stabilized by rotational C_n and spineless time-reversal symmetry. We provide a classification of such crystalline topological states and analyze their possible appearance in electronic systems and photonics crystals.

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