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,...
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| Published in | Physical review letters Vol. 117; no. 21; p. 217202 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
United States
15.11.2016
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| Online Access | Get more information |
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| Abstract | 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 Γ 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. Possible material candidates are discussed. |
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| AbstractList | 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 Γ 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. Possible material candidates are discussed. |
| Author | Xiao, Di Cheng, Ran Okamoto, Satoshi |
| Author_xml | – sequence: 1 givenname: Ran surname: Cheng fullname: Cheng, Ran organization: Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA – sequence: 2 givenname: Satoshi surname: Okamoto fullname: Okamoto, Satoshi organization: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA – sequence: 3 givenname: Di surname: Xiao fullname: Xiao, Di organization: Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/27911532$$D View this record in MEDLINE/PubMed |
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