Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session X60: Weyl semimetal, Theory II
11:15 AM–1:51 PM,
Friday, March 6, 2020
Room: Mile High Ballroom 4A
Sponsoring
Unit:
DMP
Abstract: X60.00004 : Interplay of non-Abelian band topology with crystalline symmetry*
View Presentation Abstract
Presenter:
Tomas Bzdusek
(Paul Scherrer Institute)
Authors:
Tomas Bzdusek
(Paul Scherrer Institute)
QuanSheng Wu
(EPFL Lausanne)
Alexey Soluyanov
(University of Zürich)
Adrien Bouhon
(NORDITA)
Robert-Jan Slager
(Harvard)
In this talk, we first introduce the quaternion formulation of this topological invariant as obtained by Ref. [1]. We subsequently reformulate the topology using frame rotations and Euler class [2] as developed recently by Ref. [3]. We finally present new results concerning the interplay of the non-Abelian band topology with point-group symmetry. We find that this interplay implies non-trivial conversions between Weyl points, nodal lines, and nodal chains as the system parameters (such as strain or tight-binding coefficients) are tuned.
[1] Q.-S. Wu, A. A. Soluyanov, and T. Bzdušek, Science 365, 1273 (2019)
[2] J. Ahn, S. Park, and B-J Yang, Phys. Rev. X 9, 021013 (2019)
[3] A. Bouhon, R.-J. Slager, and T. Bzdušek, arXiv:1907.10611 (2019)
*Work supported by Moore Foundation's EPiQS initiative and by SNSF Ambizione grant.
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