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Journal Article

Breakdown of topological protection due to nonmagnetic edge disorder in two-dimensional materials in the quantum spin Hall phase

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Lewenkopf,  Caio
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Lima, L. R. F., & Lewenkopf, C. (2022). Breakdown of topological protection due to nonmagnetic edge disorder in two-dimensional materials in the quantum spin Hall phase. Physical Review B, 106(24): 245408. doi:10.1103/PhysRevB.106.245408.


Cite as: https://hdl.handle.net/21.11116/0000-000C-B14A-9
Abstract
We study the suppression of the conductance quantization in quantum spin Hall systems by a combined effect of electronic interactions and edge disorder, that is ubiquitous in exfoliated and chemical vapor deposition grown two-dimensional (2D) materials. We show that the interplay between the electronic localized states due to edge defects and electron-electron interactions gives rise to local magnetic moments, that break time-reversal symmetry and the topological protection of the edge states in 2D topological systems. Our results suggest that edge disorder leads to small deviations of a perfect quantized conductance in short samples and to a strong conductance suppression in long ones. Our analysis is based on the Kane-Mele model, an unrestricted Hubbard mean-field Hamiltonian, and on a self-consistent recursive Green's function technique to calculate the transport quantities.