Spin Nernst Effect in the Paramagnetic Regime of An Antiferromagnetic Insulator

ORAL

Abstract

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 magnetic ordered state in such an insulator was proposed by Cheng et al. [PRL 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 dependent SNE in a disordered phase. We also discuss the implication of our results to experimental realizations.

*This work is supported by DOE Grant No. DE-SC0012509 (Y.Z. and D.X.) and DOE Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (S.O.)

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Presenters

  • Yinhan Zhang

    • Physics department, Carnegie Mellon University
    • International Center for Quantum Materials, Peking University

Authors

  • Yinhan Zhang

    • Physics department, Carnegie Mellon University
    • International Center for Quantum Materials, Peking University

  • Satoshi Okamoto

    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Lab
    • Oak Ridge National Lab

  • Di Xiao

    • Carnegie Mellon University
    • Physics department, Carnegie Mellon University
    • Department of Physics, Carnegie Mellon University
    • Carnegie Mellon Univ