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