Nonequilibrium transport through a gate-controlled barrier on the quantum spin Hall edge.

  title={Nonequilibrium transport through a gate-controlled barrier on the quantum spin Hall edge.},
  author={Roni Ilan and J Cayssol and Jens Hjorleifur Bardarson and Joel E. Moore},
  journal={Physical review letters},
  volume={109 21},
The quantum spin Hall insulator is characterized by the presence of gapless helical edge states where the spin of the charge carriers is locked to their direction of motion. In order to probe the properties of the edge modes, we propose a design of a tunable quantum impurity realized by a local gate under an external magnetic field. Using the integrability of the impurity model, the conductance is computed for arbitrary interactions, temperatures and voltages, including the effect of Fermi… 

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