Crossover of Quantum Anomalous Hall to Topological Hall Effects in Magnetic Topological Insulator Sandwich Heterostructures

ORAL

Abstract

Electronic band structures with non-trivial topology in momentum space and magnetic spin textures in real space have attracted enormous attention in the past decade since they harbor elegant physics relevant to the Berry curvature. The quantum anomalous Hall (QAH) effect, which is induced by the Berry curvature in the momentum space, supports dissipation-free chiral edge states. The topological Hall (TH) effect is a transport signature of the chiral spin textures that are a consequence of Berry curvature but in real-space. Both QAH and TH effects have been separately reported in magnetically doped TI materials and thus it is natural to ask if both phenomena can coexist in a single sample. Here, by inserting a TI layer between two magnetic TI layers to form a sandwich heterostructure, we observed the crossover from the QAH to TH effects through tuning electrostatic gate voltage. Our theoretical modeling suggests that the inserted TI layer decouples the two magnetic TI layers. As a consequence, the strong Dzyaloshinskii-Moriya interaction in each magnetic TI layer can give rise to chiral spin textures and lead to the TH effect. Our study provides us a new understanding of the interplay between the momentum-space and real-space Berry curvatures in magneto-transport phenomena.

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Presenters

  • Jue Jiang

    Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University

Authors

  • Jue Jiang

    Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University

  • Di Xiao

    Physics, Penn State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Fei Wang

    Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University

  • Jaeho Shin

    Department of Physics, Pennsylvania State University, Pennsylvania State University

  • Jianxiao Zhang

    Physics, Penn State University, Department of Physics, Pennsylvania State University

  • Domenico Andreoli

    Department of Physics, University of New Hampshire, Physics, University of New Hampshire

  • Run Xiao

    Physics, Penn State University, Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University, Physics, Pennsylvania State University

  • Yifan Zhao

    Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University

  • Morteza Kayyalha

    Physics, Penn State University, Department of Physics, Pennsylvania State University, Pennsylvania State University

  • Ling Zhang

    Physics, Penn State University, Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University

  • Jiadong Zang

    Department of Physics, University of New Hampshire, University of New Hampshire, Department of Physics and Materials Science Program, University of New Hampshire, Physics, University of New Hampshire

  • Chao-Xing Liu

    Pennsylvania State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University, Department of Physics, Pennsylvania State University

  • Nitin Samarth

    Department of Physics and Materials Research Institute, Pennsylvania State University, Physics, Penn State University, Physics, The Pennsylvania State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Materials Research Institute, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, Pennsylvania State University

  • Cui-Zu Chang

    Pennsylvania State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University

  • Moses H. W. Chan

    Department of Physics, Pennsylvania State University, Physics, The Pennsylvania State University, Department of Physics, The Pennsylvania State University, Pennsylvania State University