Magnetotransport study of topological phase transition in (Cd1-xZnx)3As2 thin films

ORAL

Abstract

Topological Dirac semimetal (DSM) Cd3As2, stabilized through the band inversion and the symmetry protection, provides a useful platform not only for investigating Weyl physics such as chiral anomaly, but also for pursuing topological phase transitions originating from DSM. Among others, chemical doping to control strength of the spin-orbit interaction is one effective way to modulate the band structure. In the case of Cd3As2, chemical doping of Zn is expected to suppress the band inversion of Cd3As2, leading to a transition from the DSM phase to a trivial insulator phase. In this context, we discuss magnetotransport of high quality (Cd1-xZnx)3As2 thin films under high magnetic fields. Especially when the field is aligned to the current, the longitudinal magnetoresistance exhibits a clear Zn-concentration dependence, changing from negative to positive. Along with analysis of transport properties such as Fermi velocity, effective mass, and scattering times, we have clarified details of the topological phase transition in (Cd1-xZnx)3As2.

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Presenters

  • Shinichi Nishihaya

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo

Authors

  • Shinichi Nishihaya

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo

  • Masaki Uchida

    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

  • Yusuke Nakazawa

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo

  • Kazuto Akiba

    The Institute for Solid State Physics, The University of Tokyo, ISSP, The University of Tokyo, Institute of Solid State Physics (ISSP), Univ of Tokyo

  • Markus Kriener

    RIKEN Center for Emergent Matter Science (CEMS)

  • Yusuke Kozuka

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), 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, Applied Physics, University of Tokyo

  • Atsushi Miyake

    The Institute for Solid State Physics, The University of Tokyo, University of Tokyo, ISSP, The University of Tokyo, Institute of Solid State Physics (ISSP), Univ of Tokyo

  • Yasujiro Taguchi

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

  • Masashi Tokunaga

    The Institute for Solid State Physics, The University of Tokyo, University of Tokyo, ISSP, The University of Tokyo, Institute of Solid State Physics (ISSP), Univ of Tokyo

  • Masashi Kawasaki

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), the University of Tokyo, Univ of Tokyo, The University of Tokyo, Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), Univ. of Tokyo, Applied Physics, University of Tokyo, Department of Applied Physics, The University of Tokyo, Department of Applied Physics, University of Tokyo