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Title: Spin-Nernst effect in the paramagnetic regime of an antiferromagnetic insulator

Abstract

In this study, we theoretically investigate a pure spin Hall current driven by a longitudinal temperature gradient, i.e., the spin Nernst effect (SNE), in a paramagnetic state of a collinear antiferromagnetic insulator with the Dzyaloshinskii-Moriya interaction. The SNE in a magnetic ordered state in such an insulator was proposed by Cheng et al. [R. Cheng, S. Okamoto, and D. Xiao, Phys. Rev. Lett. 117, 217202 (2016)]. Here we show that the Dzyaloshinskii-Moriya interaction can generate a pure spin Hall current even without magnetic ordering. By using a Schwinger boson mean-field theory, we calculate the temperature dependence of SNE in a disordered phase. Lastly, we also discuss the implication of our results to experimental realizations.

Authors:
 [1]; ORCiD logo [2];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Department of Physics
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
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). Materials Sciences & Engineering Division; USDOE
OSTI Identifier:
1474614
Alternate Identifier(s):
OSTI ID: 1460909
Grant/Contract Number:  
[AC05-00OR22725; SC0012509]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 98; Journal Issue: 3]; 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

Zhang, Yinhan, Okamoto, Satoshi, and Xiao, Di. Spin-Nernst effect in the paramagnetic regime of an antiferromagnetic insulator. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.035424.
Zhang, Yinhan, Okamoto, Satoshi, & Xiao, Di. Spin-Nernst effect in the paramagnetic regime of an antiferromagnetic insulator. United States. doi:10.1103/PhysRevB.98.035424.
Zhang, Yinhan, Okamoto, Satoshi, and Xiao, Di. Thu . "Spin-Nernst effect in the paramagnetic regime of an antiferromagnetic insulator". United States. doi:10.1103/PhysRevB.98.035424. https://www.osti.gov/servlets/purl/1474614.
@article{osti_1474614,
title = {Spin-Nernst effect in the paramagnetic regime of an antiferromagnetic insulator},
author = {Zhang, Yinhan and Okamoto, Satoshi and Xiao, Di},
abstractNote = {In this study, we theoretically investigate a pure spin Hall current driven by a longitudinal temperature gradient, i.e., the spin Nernst effect (SNE), in a paramagnetic state of a collinear antiferromagnetic insulator with the Dzyaloshinskii-Moriya interaction. The SNE in a magnetic ordered state in such an insulator was proposed by Cheng et al. [R. Cheng, S. Okamoto, and D. Xiao, Phys. Rev. Lett. 117, 217202 (2016)]. Here we show that the Dzyaloshinskii-Moriya interaction can generate a pure spin Hall current even without magnetic ordering. By using a Schwinger boson mean-field theory, we calculate the temperature dependence of SNE in a disordered phase. Lastly, we also discuss the implication of our results to experimental realizations.},
doi = {10.1103/PhysRevB.98.035424},
journal = {Physical Review B},
number = [3],
volume = [98],
place = {United States},
year = {2018},
month = {7}
}

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