Interplay of quantum spin Hall effect and spontaneous time-reversal symmetry breaking in electron-hole bilayers. I. Transport properties
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-12-15
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en
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10
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Physical Review B, Volume 106, issue 23, pp. 1-10
Abstract
The band-inverted electron-hole bilayers, such as InAs/GaSb, are an interesting playground for the interplay of quantum spin Hall effect and correlation effects because of the small density of electrons and holes and the relatively small hybridization between the electron and hole bands. It has been proposed that Coulomb interactions lead to a time-reversal symmetry broken phase when the electron and hole densities are tuned from the trivial to the quantum spin Hall insulator regime. We show that the transport properties of the system in the time-reversal symmetry broken phase are consistent with recent experimental observations in InAs/GaSb. Moreover, we carry out a quantum transport study on a Corbino disk where the bulk and edge contributions to the conductance can be separated. We show that the edge becomes smoothly conducting and the bulk is always insulating when one tunes the system from the trivial to the quantum spin Hall insulator phase, providing unambiguous transport signatures of the time-reversal symmetry broken phase.Description
Funding Information: We thank D. I. Pikulin for useful discussions and comments. The paper is supported by the Foundation for Polish Science through the IRA Programme cofinanced by EU within SG OP and the Academy of Finland Project No. 331094. We acknowledge the computational resources provided by the Aalto Science-IT project and the access to the computing facilities of the Interdisciplinary Center of Modeling at the University of Warsaw, Grants No. GB82-13, No. G78-13, and No. G75-10. Publisher Copyright: © 2022 American Physical Society.
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Paul, T, Becerra, V F & Hyart, T 2022, ' Interplay of quantum spin Hall effect and spontaneous time-reversal symmetry breaking in electron-hole bilayers. I. Transport properties ', Physical Review B, vol. 106, no. 23, 235420, pp. 1-10 . https://doi.org/10.1103/PhysRevB.106.235420