Disorder and interaction effects in quantum wires

L. W. Smith, K. J. Thomas, M. Pepper, D. A. Ritchie, I. Farrer, J. P. Griffiths, G. A.C. Jones

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)

Abstract

We present conductance measurements of quasi-one-dimensional quantum wires affected by random disorder in a GaAs/AlGaAs heterostructure. In addition to quantised conductance plateaux, we observe structure superimposed on the conductance characteristics when the channel is wide and the density is low. Magnetic field and temperature are varied to characterize the conductance features which depend on the lateral position of the 1D channel formed in a split-gate device. Our results suggest that there is enhanced backscattering in the wide channel limit, which gives rise to quantum interference effects. When the wires are free of disorder and wide, the confinement is weak so that the mutual repulsion of the electrons forces a single row to split into two. The relationship of this topological change to the disorder in the system will be discussed.

Original languageEnglish
Article number012018
JournalJournal of Physics: Conference Series
Volume376
Issue number1
DOIs
Publication statusPublished - 2012
Event14th International Conference on Transport in Interacting Disordered Systems, TIDS-14 - Acre, Israel
Duration: 2011 Sept 52011 Sept 8

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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