Heinzel, Thomas H. and Salis, G. and Held, R. and Lüscher, S. and Ensslin, Klaus and Wegscheider, Werner and Bichler, Max
Shifting a quantum wire through a disordered crystal: Observation of conductance fluctuations in real space.
Physical Review B 61 (20), R13353-R13356.
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.