Chiral topological insulator of magnons

Li, Bo; Kovalev, Alexey A.

doi:10.1103/PhysRevB.97.174413

Title: Chiral topological insulator of magnons

Journal Article · Mon May 14 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.97.174413· OSTI ID:1437007

Li, Bo ^[1]; Kovalev, Alexey A. ^[1]

Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience

Here, we propose a magnon realization of 3D topological insulator in the AIII (chiral symmetry) topological class. The topological magnon gap opens due to the presence of Dzyaloshinskii-Moriya interactions. The existence of the topological invariant is established by calculating the bulk winding number of the system. Within our model, the surface magnon Dirac cone is protected by the sublattice chiral symmetry. By analyzing the magnon surface modes, we confirm that the backscattering is prohibited. By weakly breaking the chiral symmetry, we observe the magnon Hall response on the surface due to opening of the gap. Finally, we show that by changing certain parameters, the system can be tuned between the chiral topological insulator, three-dimensional magnon anomalous Hall, and Weyl magnon phases.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014189

OSTI ID:: 1437007

Alternate ID(s):: OSTI ID: 1437078

Journal Information:: Physical Review B, Vol. 97, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Cited By (2)

Effects of spin-dependent electronic correlations on surface states in topological insulators Toklikishvili, Z.; Chotorlishvili, L.; Stagraczyński, S. Physical Review B, Vol. 100, Issue 23 https://doi.org/10.1103/physrevb.100.235419	journal	December 2019
Topological Magnons and Edge States in Antiferromagnetic Skyrmion Crystals Diaz, Sebastian A.; Klinovaja, Jelena; Loss, Daniel arXiv https://doi.org/10.48550/arxiv.1812.11125	text	January 2018

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