Unidirectional magnetoresistance in a bulk Rashba ferromagnet

ORAL

Abstract

The Rashba effect is the spin band splitting due to broken inversion symmetry through spin-orbit coupling, typically observed at surfaces and interfaces. Recently, some noncentrosymmetryic crystals have been found to have the bulk Rashba bands that are larger than surface/interface ones. Nonreciprocal transport of quantum particles such as electron, spin and phonon is known to occur by further breaking time reversal symmetry in such a material without inversion symmetry. In particular, the interplay with magnetism in spin-polarized bands may enhance the nonreciprocal charge transport. In this study, we investigated the unidirectional magnetoresistance in thin films of Ge1-xMnxTe, which is a bulk ferromagnetic Rashba semiconductor. The magnitude of nonreciprocal transport shows a strong dependence on carrier density, which suggests that the scattering process on Fermi surface is essential for the nonreciprocal transport in the system.

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Presenters

  • Ryutaro Yoshimi

    • RIKEN CEMS
    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN

Authors

  • Ryutaro Yoshimi

    • RIKEN CEMS
    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN

  • Kenji Yasuda

    • Massachusetts Institute of Technology
    • MIT
    • Department of applied physics, The University of Tokyo

  • Atsushi Tsukazaki

    • Tohoku University
    • Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
    • IMR Tohoku University
    • IMR, Tohoku Univ.
    • Institute for Materials Research, Tohoku University

  • Minoru Kawamura

    • RIKEN CEMS
    • CEMS, RIKEN

  • Kei Takahashi

    • RIKEN CEMS
    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN

  • Masashi Kawasaki

    • The University of Tokyo
    • Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), The University of Tokyo, Tokyo 113-8656, Japan
    • University of Tokyo
    • Applied Physics and QPEC, University of Tokyo
    • Department of applied physics, The University of Tokyo
    • Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo
    • Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Tokyo, Japan.

  • Yoshinori Tokura

    • RIKEN Center for Emergent Matter Science (CEMS)
    • RIKEN Center for Emergent Matter Science
    • RIKEN CEMS
    • RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan
    • Center for Emergent Matter Science (CEMS), RIKEN
    • Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo
    • University of Tokyo
    • University of Tokyo and RIKEN CEMS
    • CEMS, RIKEN
    • Center for Emergent Matter Science, RIKEN
    • Department of Applied Physics, University of Tokyo
    • University of Tokyo and RIKEN-CEMS