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Title: Spin Nernst effect of magnons in collinear antiferromagnets

In a collinear antiferromagnet with easy-axis anisotropy, symmetry guarantees that the spin wave modes are doubly degenerate. The two modes carry opposite spin angular momentum and exhibit opposite chirality. Using a honeycomb antiferromagnet in the presence of the Dzyaloshinskii-Moriya interaction, we show that a longitudinal temperature gradient can drive the two modes to opposite transverse directions, realizing a spin Nernst effect of magnons with vanishing thermal Hall current. We find that magnons around the $$\Gamma$$ point and the $K$ point contribute oppositely to the transverse spin transport, and their competition leads to a sign change of the spin Nernst coefficient at finite temperature. As a result, possible material candidates are discussed.
Authors:
 [1] ;  [2] ;  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0012509
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 21; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1333660
Alternate Identifier(s):
OSTI ID: 1332147

Cheng, Ran, Okamoto, Satoshi, and Xiao, Di. Spin Nernst effect of magnons in collinear antiferromagnets. United States: N. p., Web. doi:10.1103/PhysRevLett.117.217202.
Cheng, Ran, Okamoto, Satoshi, & Xiao, Di. Spin Nernst effect of magnons in collinear antiferromagnets. United States. doi:10.1103/PhysRevLett.117.217202.
Cheng, Ran, Okamoto, Satoshi, and Xiao, Di. 2016. "Spin Nernst effect of magnons in collinear antiferromagnets". United States. doi:10.1103/PhysRevLett.117.217202. https://www.osti.gov/servlets/purl/1333660.
@article{osti_1333660,
title = {Spin Nernst effect of magnons in collinear antiferromagnets},
author = {Cheng, Ran and Okamoto, Satoshi and Xiao, Di},
abstractNote = {In a collinear antiferromagnet with easy-axis anisotropy, symmetry guarantees that the spin wave modes are doubly degenerate. The two modes carry opposite spin angular momentum and exhibit opposite chirality. Using a honeycomb antiferromagnet in the presence of the Dzyaloshinskii-Moriya interaction, we show that a longitudinal temperature gradient can drive the two modes to opposite transverse directions, realizing a spin Nernst effect of magnons with vanishing thermal Hall current. We find that magnons around the $\Gamma$ point and the $K$ point contribute oppositely to the transverse spin transport, and their competition leads to a sign change of the spin Nernst coefficient at finite temperature. As a result, possible material candidates are discussed.},
doi = {10.1103/PhysRevLett.117.217202},
journal = {Physical Review Letters},
number = 21,
volume = 117,
place = {United States},
year = {2016},
month = {11}
}