Nonreciprocal charge transport at topological insulator/superconductor interface

ORAL

Abstract

Topological superconductor (TSC) is attracting growing interest for its potential application to topological quantum computation. The superconducting proximity effect on the topological insulator (TI) surface state is one promising way to yield the topological superconductivity. The superconductivity realized at the interface between TI Bi2Te3 and non-superconductor FeTe is one of such candidates because the mutual interaction between superconductivity and topological order is expected. Here, to detect the effect of spin-momentum locking in the Cooper pair, we investigate nonreciprocal transport; i.e. current-direction dependent resistance, which is sensitive to the broken inversion symmetry of the electronic state. The largely enhanced nonreciprocal phenomenon is detected in the Bi2Te3/FeTe heterostructure associated with the superconducting transition. The emergent nonreciprocal signal at low magnetic fields is attributed to the current-induced modulation of supercurrent density under in-plane magnetic fields perpendicular to current, exemplifying the close connection between the superconductivity and the topological electronic state at the interface.

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Presenters

  • Kenji Yasuda

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

Authors

  • Kenji Yasuda

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

  • Hironori Yasuda

    Department of applied physics, The University of Tokyo

  • Tian Liang

    Center for Emergent Matter Science, RIKEN

  • Ryutaro Yoshimi

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

  • 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

  • Kei Takahashi

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

  • Naoto Nagaosa

    University of Tokyo, Riken CEMS, Department of Applied Physics, University of Tokyo, RIKEN Center for Emergent Matter Science (CEMS), RIKEN CEMS, Center for Emergent Matter Science, RIKEN, RIKEN, Department of applied physics, The University of Tokyo, Department of Applied Physics, Universtiy of Tokyo, University of Tokyo

  • 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