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  • Letter
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Mapping the phase diagram of the quantum anomalous Hall and topological Hall effects in a dual-gated magnetic topological insulator heterostructure

Run Xiao1,*, Di Xiao1,*, Jue Jiang1,*, Jae-Ho Shin1, Fei Wang1, Yi-Fan Zhao1, Ruo-Xi Zhang1, Anthony Richardella1,2, Ke Wang2 et al.

Morteza Kayyalha3, Moses H. W. Chan1, Chao-Xing Liu1, Cui-Zu Chang1, and Nitin Samarth1,†

  • 1Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 2Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 3Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

  • *These authors contributed equally to this work.
  • †nsamarth@psu.edu
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Phys. Rev. Research 3, L032004 – Published 6 July, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032004

Abstract

We use magnetotransport in dual-gated magnetic topological insulator heterostructures to map out a phase diagram of the topological Hall and quantum anomalous Hall effects as a function of the chemical potential (primarily determined by the back gate voltage) and the asymmetric potential (primarily determined by the top gate voltage). A theoretical model that includes both surface states and valence band quantum well states allows the evaluation of the variation of the Dzyaloshinskii-Moriya interaction and carrier density with gate voltages. The qualitative agreement between experiment and theory provides strong evidence for the existence of a topological Hall effect in the system studied, opening up a route for understanding and manipulating chiral magnetic spin textures in real space.

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Phys. Rev. Research 3, L032004– Published 6 July, 2021
  • Received 10 March 2021
  • Accepted 12 May 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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