Inelastic electron backscattering in a generic helical edge channel

Details Inelastic electron backscattering in a generic helical edge channel Inelastic electron backscattering in a generic helical edge channel

2011-12-31

arxiv.org/abs/1201.0278v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 3 figures

Scientific paper

We evaluate the low-temperature conductance of a weakly interacting one-dimensional helical liquid without axial spin symmetry. The lack of that symmetry allows for inelastic backscattering of a single electron, accompanied by forward-scattering of another. This joint effect of weak interactions and potential scattering off impurities results in a temperature-dependent deviation from the quantized conductance, $\delta G \propto T^4$. In addition, $\delta G$ is sensitive to the position of the Fermi level. We determine numerically the parameters entering our generic model for the Bernevig-Hughes-Zhang Hamiltonian of a HgTe/CdTe quantum well in the presence of Rashba spin-orbit coupling.

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