Signature of interaction in dc transport of ac gated Quantum Spin Hall edge states

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 effect 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.

4 pages, 2 Figures

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• Photoexcitation of electron wave packets in quantum spin Hall edge states: effects of chiral anomaly from a localised electric pulse
• The antiferromagnetic phase of the Floquet-driven Hubbard model
• Charge and energy fractionalization mechanism in one-dimensional channels
• Unified time-dependent perturbative relations applied to spectroscopy through photo-drag current
• Transient dynamics of spin-polarized injection in helical Luttinger liquids
• Dynamical transport measurement of the Luttinger parameter in helical edges states of 2D topological insulators
• Interplay between Rashba interaction and electromagnetic field in the edge states of a 2D topological insulator
• Transport signatures in topological systems coupled to AC fields
• Effects of disorder on electron tunneling through helical edge states
• Photoexcitation in two-dimensional topological insulators: Generating and controlling electron wavepackets in Quantum Spin Hall systems
• Series expansion of the quantum admittance in mesoscopic systems
• Electron transport in quantum channels with spin-orbit interaction: Effects of the sign of the Rashba coupling and applications to nanowires
• Time dependent local potential in a Tomonaga-Luttinger liquid