In the presence of a scattering potential, electron transport in a quantum wire is known to be dramatically modified by backward-scattering and unaffected by forward-scattering processes. We show that the scenario is quite different in quantum spin Hall edge states coupled at a constriction. The helical nature of these states leads to the appearance of a forward-scattering spin channel that is absent in other Luttinger-liquid realizations. Suitably applied ac gate voltages can thus operate on the spin of electrons tunneling across the constriction, and induce in the dc tunneling current a cusp pattern that represents the signature of the edge-state electronic interaction.

Signature of interaction in dc transport of ac-gated quantum spin Hall edge states / Dolcini, Fabrizio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 85:3(2012), pp. 033306-1-033306-4. [10.1103/PhysRevB.85.033306]

Signature of interaction in dc transport of ac-gated quantum spin Hall edge states

DOLCINI, FABRIZIO
2012

Abstract

In the presence of a scattering potential, electron transport in a quantum wire is known to be dramatically modified by backward-scattering and unaffected by forward-scattering processes. We show that the scenario is quite different in quantum spin Hall edge states coupled at a constriction. The helical nature of these states leads to the appearance of a forward-scattering spin channel that is absent in other Luttinger-liquid realizations. Suitably applied ac gate voltages can thus operate on the spin of electrons tunneling across the constriction, and induce in the dc tunneling current a cusp pattern that represents the signature of the edge-state electronic interaction.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2482985
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