Can the conductance of an adiabatic ballistic constriction be lower than $2e^2/h$?

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dc.creatorLiang, C. -T.
dc.creatorTkachenko, O. A.
dc.creatorTkachenko, V. A.
dc.creatorBaksheyev, D. G.
dc.creatorSimmons, M. Y.
dc.creatorRitchie, D. A.
dc.creatorPepper, M.
dc.date2005-03-17
dc.date.accessioned2026-07-07T03:04:13Z
dc.date.available2026-07-07T03:04:13Z
dc.descriptionWe have performed four-terminal conductance measurements of a one-dimensional (1D) channel in which it is possible to modulate the potential profile using three overlaying finger gates. In such a 1D ballistic structure we have observed, {\em for the first time,} that the conductance steps show a gradual decrease from $2e^2/h$ to $0.97 \times 2e^2/h$ with increasing negative finger gate voltage in a short, clean 1D constriction. We suggest this phenomenon is due to differing shifts of 1D subbands with changing spilt-gate voltage. Both a simple analytical estimate for an adiabatic constriction and, realistic modeling of the device, give the same magnitude of the conductance decrease as observed in our experiments.
dc.description5 pages, 3 figures. Our results show that a deviation from the quantized value $2e^2/h$ is possible even in a clean short ballistic constriction
dc.identifierhttps://arxiv.org/abs/cond-mat/0503414
dc.identifierhttp://arxiv.org/abs/cond-mat/0503414
dc.identifierPhys. Rev. B 70, 195324 (2004)
dc.identifierdoi:10.1103/PhysRevB.70.195324
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/26048
dc.subjectMesoscale and Nanoscale Physics
dc.titleCan the conductance of an adiabatic ballistic constriction be lower than $2e^2/h$?
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