Unidirectional magneto-transport of linearly dispersing topological edge states
arXiv:2108.05378 · doi:10.1103/PhysRevB.104.L081406
Abstract
Quantum spin-Hall edges are envisaged as next-generation transistors, yet they exhibit dissipationless transport only over short distances. Here we show that in a diffusive sample, where charge puddles with odd spin cause back-scattering, a magnetic field drastically increases the mean free path and drives the system into the ballistic regime with a Landauer-Buttiker conductance. A strong non-linear non-reciprocal current emerges in the diffusive regime with opposite signs on each edge, and vanishes in the ballistic limit. We discuss its detection in state-of-the-art experiments.
arXiv comment4 pages, 4 figures, Accepted for publication in Phys. Rev. B Rapid Communications
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