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Coupled double-row formation in a quasi-1D wire

Smith, LW; Hew, WK; Thomas, KJ; Pepper, M; Farrer, I; Anderson, D; ... Ritchie, DA; + view all (2010) Coupled double-row formation in a quasi-1D wire. In: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES. (pp. 1114 - 1117). ELSEVIER SCIENCE BV

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Abstract

We investigate one-dimensional (1D) quantum wires in the weak confinement regime, where, at certain densities, the 1D system of electrons bifurcates into two rows. We show that the two rows are coupled, forming bonding and antibonding states, and that the coupling persists in magnetic fields from 0 to 16 T. In order fors double row to form, the Coulomb interactions in the channel must overcome the confining potential, which can be achieved by tuning the density and confinement. Using a split-gate device with a top gate and back gate, we observe a transition from single-row to double-row behaviour in the weak confinement regime. We further probe the characteristics of the coupled double row regime with dc source-drain bias measurements. (C) 2009 Elsevier B.V. All rights reserved.

Type:Proceedings paper
Title:Coupled double-row formation in a quasi-1D wire
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.2009.11.001
Keywords:One-dimensional electron transport, Quantum wires, Coupled, Back gate
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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