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Inelastic electron Backscattering in a generic helical edge channel

Research output: Contribution to journalJournal article


Article number156402
Journal publication date11/04/2012
JournalPhysical Review Letters
Number of pages5
Original languageEnglish


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 proportional to 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.

Bibliographic note

© 2012 American Physical Society