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Title: Chiral topological insulator of magnons

Abstract

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.

Authors:
 [1];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1437007
Alternate Identifier(s):
OSTI ID: 1437078
Grant/Contract Number:  
SC0014189
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Li, Bo, and Kovalev, Alexey A. Chiral topological insulator of magnons. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.174413.
Li, Bo, & Kovalev, Alexey A. Chiral topological insulator of magnons. United States. doi:10.1103/PhysRevB.97.174413.
Li, Bo, and Kovalev, Alexey A. Mon . "Chiral topological insulator of magnons". United States. doi:10.1103/PhysRevB.97.174413. https://www.osti.gov/servlets/purl/1437007.
@article{osti_1437007,
title = {Chiral topological insulator of magnons},
author = {Li, Bo and Kovalev, Alexey A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.97.174413},
journal = {Physical Review B},
issn = {2469-9950},
number = 17,
volume = 97,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
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Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010