Nonreciprocal transport in Landau-Zener problem

ORAL

Abstract

Responses of quantum materials against external stimuli show a rich variety according to the symmetries of the underlying microscopic Hamiltonian. In particular, nonreciprocal response with a directional transport is an important class of phenomena, which can emerge in noncentrosymmetric materials. As typified in Onsager’s reciprocal relation, however, the presence of the time-reversal symmetry sometimes forbids the directionality.

In this talk, we report two types of new nonreciprocal transport peculiar to time-reversal symmetric insulating systems. One is the dissipative electric current with a nonreciprocal tunneling probability, which emerges due to the geometric correction to the Landau-Zener formula [1]. The other is the spin transport in the presence of the assymetic spin-orbit coupling, which arises due to the assymetric momentum distribution peculiar to the tunneling electrons in a dissipative environment [2].

[1] S. Kitamura, N. Nagaosa, and T. Morimoto, Commun. Phys. 3, 63 (2020).
[2] S. Kitamura, N. Nagaosa, and T. Morimoto, arXiv:2009.03596.

*SK is supported by JSPS KAKENHI (20K14407). TM acknowledges supports from JST PRESTO (JPMJPR19L9), JST CREST (JPMJCR19T3). NN is supported by JST CREST (JPMJCR1874 and JPMJCR16F1), JSPS KAKENHI (18H03676 and 26103006).

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Presenters

  • Sota Kitamura

    • Department of Applied Physics, University of Tokyo
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo
    • The University of Tokyo

Authors

  • Sota Kitamura

    • Department of Applied Physics, University of Tokyo
    • Univ of Tokyo
    • Department of Applied Physics, The University of Tokyo
    • The University of Tokyo

  • Naoto Nagaosa

    • Center for Emergent Matter Science, RIKEN
    • Department of Applied Physics, University of Tokyo
    • University of Tokyo
    • RIKEN

  • Takahiro Morimoto

    • Department of Applied Physics, University of Tokyo
    • Univ of Tokyo