Non-Equilibrium Transport Through a Gate-Controlled Barrier on the Quantum Spin Hall Edge

Jens H. Bardarson; J\'er\^ome Cayssol; Joel E. Moore; Roni Ilan

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Non-Equilibrium Transport Through a Gate-Controlled Barrier on the Quantum Spin Hall Edge

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arxiv 1206.5211 v1 pith:4RJEM54C submitted 2012-06-22 cond-mat.str-el cond-mat.mes-hall

Non-Equilibrium Transport Through a Gate-Controlled Barrier on the Quantum Spin Hall Edge

Roni Ilan , J\'er\^ome Cayssol , Jens H. Bardarson , Joel E. Moore This is my paper

classification cond-mat.str-el cond-mat.mes-hall

keywords edgequantumspinhallimpurityinteractionstransportarbitrary

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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 liquid leads. The result can be used to infer the strength of interactions from transport experiments

Non-Equilibrium Transport Through a Gate-Controlled Barrier on the Quantum Spin Hall Edge

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