Conductance Fluctuations in PbTe Wide Parabolic Quantum Wells
J. Oswald, G. Heigl, G. Span, A.Homer, P.Ganitzer (University of, Leoben, Austria), D.K. Maude, J.C. Portal (High Magnetic Field Laboratory,, Grenoble, France)
TL;DR
This paper investigates conductance fluctuations in PbTe wide parabolic quantum wells, revealing edge channel effects as the primary cause, with fluctuations comparable to fundamental quantum units despite macroscopic sample sizes.
Contribution
It demonstrates that conductance fluctuations in macroscopic PbTe quantum wells are due to edge channel effects, a novel insight into quantum transport phenomena.
Findings
Fluctuations have amplitudes close to e^2/h.
Fluctuations are attributed to edge channel effects.
Macroscopic samples exhibit quantum conductance features.
Abstract
We report on conductance fluctuations which are observed in local and non-local magnetotransport experiments. Although the Hall bar samples are of macroscopic size, the amplitude of the fluctuations from the local measurements is close to e^2/h. It is shown that the fluctuations have to be attributed to edge channel effects.
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