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  • Letter
  • Open Access

Two-dimensional topological Anderson insulator in a HgTe-based semimetal

D. A. Khudaiberdiev1, Z. D. Kvon2,3, M. S. Ryzhkov1, D. A. Kozlov4, N. N. Mikhailov2, and A. Pimenov1

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Phys. Rev. Research 7, L022033 – Published 9 May, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022033

Abstract

We report the experimental observation of Anderson localization in two-dimensional (2D) electrons and holes in the bulk of HgTe quantum wells with a semimetallic spectrum and under strong disorder. Surprisingly, the one-dimensional (1D) edge channels, arising from the spectrum's inversion, demonstrate remarkable robustness against disorder due to topological protection. Strong disorder induces a mobility gap in the bulk, enabling access to the 1D edge states and thereby realizing the two-dimensional topological Anderson insulator (TAI) state. Nonlocal transport measurements confirm the emergence of topologically protected edge channels. The TAI state appears to be very sensitive to an external magnetic field applied perpendicular to the sample. The weak magnetic field of 30 mT breaks the topological protection of 1D edge channels, thus turning the system into an ordinary Anderson insulator. At a field of 0.5 T, the 2D bulk electrons become delocalized, and the system transforms into a quantum Hall liquid.

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Information

Phys. Rev. Research 7, L022033– Published 9 May, 2025
  • Received 26 April 2024
  • Accepted 8 April 2025
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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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