Shifting a Quantum Wire through a Disordered Crystal: Observation of Conductance Fluctuations in Real Space

Details Shifting a Quantum Wire through a Disordered Crystal: Observation of Conductance Fluctuations in Real Space Shifting a Quantum Wire through a Disordered Crystal: Observation of Conductance Fluctuations in Real Space

1999-09-23

arxiv.org/abs/cond-mat/9909337v1

Physical Review B 61, R13353 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.61.R13353

A quantum wire is spatially displaced by suitable electric fields with respect to the scatterers inside a semiconductor crystal. As a function of the wire position, the low-temperature resistance shows reproducible fluctuations. Their characteristic temperature scale is a few hundred millikelvin, indicating a phase-coherent effect. Each fluctuation corresponds to a single scatterer entering or leaving the wire. This way, scattering centers can be counted one by one.

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