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Evidence for a magnetic-field induced ideal type-II Weyl state in antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4

Authors :
Lee, Seng Huat
Graf, David
Zhu, Yanglin
Yi, Hemian
Ciocys, Samuel
Choi, Eun Sang
Basnet, Rabindra
Fereidouni, Arash
Wegner, Aaron
Zhao, Yi-Fan
Min, Lujin
Verlinde, Katrina
He, Jingyang
Redwing, Ronald
Gopalan, V.
Churchill, Hugh O. H.
Lanzara, Alessandra
Samarth, Nitin
Chang, Cui-Zu
Hu, Jin
Mao, Z. Q.
Source :
Phys. Rev. X 11, 031032 (2021)
Publication Year :
2020

Abstract

The discovery of Weyl semimetals (WSMs) has fueled tremendous interest in condensed matter physics. WSMs require breaking of either inversion symmetry (IS) or time-reversal symmetry (TRS); they can be categorized into type-I and type-II WSMs, characterized by un-tilted and strongly tilted Weyl cones respectively. Type-I WSMs with breaking of IS or TRS and type-II WSMs with IS breaking have been realized experimentally, but TRS-breaking type-II WSM still remains elusive. In this article, we report an ideal TRS-breaking type-II WSM with only one pair of Weyl nodes observed in the antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4 under magnetic fields. This state is manifested by a large intrinsic anomalous Hall effect, a non-trivial $\mathrm{{\pi}}$ Berry phase of the cyclotron orbit and a large positive magnetoresistance in the ferromagnetic phase at an optimal sample composition. Our results establish a promising platform for exploring the physics underlying the long-sought, ideal TRS breaking type-II WSM.<br />Comment: 28 Pages, 5 Figures

Details

Database :
arXiv
Journal :
Phys. Rev. X 11, 031032 (2021)
Publication Type :
Report
Accession number :
edsarx.2002.10683
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevX.11.031032