Negative longitudinal magnetoresistance in GaAs quantum wells

ORAL

Abstract


Negative longitudinal magnetoresistances (NLMRs) have been observed in a variety of materials and often considered to be associated with Weyl fermions that have a defined chirality. We conducted magnetotransport measurements and observed NLMRs in non-Weyl GaAs quantum wells. We observed pronounced NLMRs up to 9 Tesla at temperatures above the transition temperature and also weak NLMRs at low magnetic fields at temperatures close to the transition and at very low temperatures. The observed NLMRs show various types of magnetic field behavior, the origin of which we attribute to microscopic disorder and we use a phenomenological model to account for the various features. Our results showcase a new contribution of microscopic disorder to the occurrence of novel phenomena. They may stimulate further work on tuning electronic properties via disorder/defect nano-engineering.

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Presenters

  • Jing Xu

    Northern Illinois University, Materials Science Division, Argonne National Laboratory, Argonne National Lab

Authors

  • Jing Xu

    Northern Illinois University, Materials Science Division, Argonne National Laboratory, Argonne National Lab

  • Meng Ma

    Princeton University

  • Zhili Xiao

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Argonne National Lab

  • Yonglei Wang

    Nanjing University, Physics, Nanjing University, Materials Science Division, Argonne National Laboratory

  • Dafei Jin

    Center for Nanoscale Materials, Argonne National Laboratory, Argonne National Lab

  • Yangyang Lyu

    Nanjing University

  • Wei Zhang

    Department of Physics, Oakland University, Oakland University

  • Loren Pfeiffer

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, Princeton University, Electrical Engineering, Princeton

  • Kenneth West

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, University of Pittsburgh, Electrical Engineering, Princeton

  • K. W. Baldwin

    Electrical Engineering, Princeton University, Princeton University

  • Mansour Shayegan

    Princeton University

  • Wai-Kwong Kwok

    Argonne National Laboratory, Materials Science Division, Argonne National Laboratory, Material Science Division, Argonne National Laboratory, Materials Sciences Division, Argonne National Laboratory, Argonne National Lab

  • Maksim Sultanov

    Northern Illinois University