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Double-row transport in quantum wires of shallow confinement

Hew, WK; Thomas, KJ; Pepper, M; Farrer, I; Anderson, D; Jones, GAC; Ritchie, DA; (2010) Double-row transport in quantum wires of shallow confinement. In: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES. (pp. 1118 - 1121). ELSEVIER SCIENCE BV

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Abstract

The bifurcation of the electron system in a quantum wire has been observed in the form of the suppression and disappearance of the quantised conductance plateau at 2e(2)/h. We now present low-temperature transport measurements of a top-gated split-gate quantum wire that serve to further characterise this double-row regime of transport. A small distortion of the confinement caused by asymmetrical biasing of the split gates gives rise to a radical change in the conductance characteristics of the wire, beginning with the introduction of a plateau at G = e(2)/h which rises to around 0.7 x 2e(2)/h with greater differential bias between the split gates. DC source-drain bias measurements in this regime show a split zero-bias peak at low conductances merging into a single peak around G = 0.7 x e(2)/h, which then persists up to the plateau at 4e(2)/h. (C) 2009 Elsevier B.V. All rights reserved.

Type:Proceedings paper
Title:Double-row transport in quantum wires of shallow confinement
Event:18th International Conference on Electronic Properties of Two-Dimensional Systems
Location:Kobe, JAPAN
Dates:2009-07-19 - 2009-07-24
DOI:10.1016/j.physe.2009.11.009
Keywords:Quantum wire, One-dimensional electron transport, Wigner crystal, Electron interaction
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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