"Real" multi-gap topologies in materials

by Prof. Adrien Bouhon (Nordita)

Monday 27 Nov 2023, 10:00 → 11:00 Asia/Shanghai

TDLI Meeting Room N600 (East Wing of Floor 6, North Building)

Abstract

The past few years have seen rapid progress in characterizing topological band structures using methods based on symmetry eigenvalues. Recently, however, there has been increasing theoretical and experimental interest in multi-gap dependent topological phases that cannot be captured by this paradigm. In essence, these topologies arise by braiding band degeneracies connecting successive energy bands and carry non-Abelian topological charges due to the presence of either MT (mirror and time reversal), C2T (Pi-rotation and time reversal) or IT (inversion and time reversal) symmetries, culminating in different invariants such as Z-valued first and second Euler classes. In this talk, I will review these fundamental concepts and present their consequences for real material candidates, and show their early experimental signatures.

Biography

Prof. Adrien Bouhon is an assistant professor of Nordita.

Division

Condensed Matter

Other information

Tencent Meeting link: https://meeting.tencent.com/dm/nwBOol7dU4zg   Meeting ID: 491 954 117   no password