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Magnon Spin Nernst Effect in Antiferromagnets
Vladimir A Zyuzin1, Alexey A Kovalev1
1Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA.
Physical Review Letters
|December 3, 2016
Summary
A temperature gradient can create a spin Hall response in antiferromagnets using magnons, even when thermal Hall effects are restricted. This research explores the role of magnon edge states in specific geometries.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Magnonics
Background:
- Antiferromagnets exhibit complex magnetic excitations called magnons.
- Berry curvature in magnonic systems can lead to exotic transport phenomena.
- Spin Hall effects are crucial for spintronic devices.
Purpose of the Study:
- To theoretically predict and investigate a magnon-mediated spin Hall response induced by a temperature gradient.
- To establish a general framework for defining Hall currents under symmetry constraints.
- To explore the influence of magnon edge states in finite antiferromagnetic systems.
Main Methods:
- Development of a linear response theory.
- Analysis of a honeycomb lattice antiferromagnet model.
- Investigation of magnonic Berry curvature effects.
Main Results:
- A temperature gradient can indeed induce a magnon-mediated spin Hall response.
- A general condition for a well-defined Hall current was derived, applicable even when thermal Hall response is forbidden.
- The role of magnon edge states in finite geometries was discussed.
Conclusions:
- The study provides a theoretical foundation for temperature-gradient-driven spin transport in antiferromagnets.
- The findings highlight the potential of utilizing magnonic Berry curvature for novel spintronic functionalities.
- Edge states play a significant role in the observed phenomena in finite systems.
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