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Shifting a quantum wire through a disordered crystal: Observation of conductance fluctuations in real space

Heinzel, Thomas H. ; Salis, G. ; Held, R. ; Lüscher, S. ; Ensslin, Klaus ; Wegscheider, Werner ; Bichler, Max
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Date of publication of this fulltext: 30 Nov 2009 13:25


Abstract

A quantum wire is spatially displaced by suitable electric fields with respect to the scattering potentials inside a semiconductor crystal. As a function of the wire position, the low-temperature conductance shows reproducible fluctuations. Their characteristic temperature scale is a few hundred millikelvin, indicating a phase-coherent effect. One fluctuation is attributed to a single bump in the scattering potential entering or leaving the wire.


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