Unusual conductance collapse in one-dimensional quantum structures

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dc.creatorThomas, KJ
dc.creatorSawkey, DL
dc.creatorPepper, M
dc.creatorTribe, WR
dc.creatorFarrer, I
dc.creatorSimmons, MY
dc.creatorRitchie, DA
dc.date2004-06-01
dc.date.accessioned2026-07-07T02:58:25Z
dc.date.available2026-07-07T02:58:25Z
dc.descriptionWe report an unusual insulating state in one-dimensional quantum wires with a non-uniform confinement potential. The wires consist of a series of closely spaced split gates in high mobility GaAs/AlGaAs heterostructures. At certain combinations of wire widths, the conductance abruptly drops over three orders of magnitude, to zero on a linear scale. Two types of collapse are observed, one occurring in multi-subband wires in zero magnetic field and one in single subband wires in an in-plane field. The conductance of the wire in the collapse region is thermally activated with an energy of the order of 1 K. At low temperatures, the conductance shows a steep rise beyond a threshold DC source-drain voltage of order 1 mV, indicative of a gap in the density of states. Magnetic depopulation measurements show a decrease in the carrier density with lowering temperature. We discuss these results in the context of many-body effects such as charge density waves and Wigner crystallization in quantum wires.
dc.description5 pages, 5 eps figures, revtex
dc.identifierhttps://arxiv.org/abs/cond-mat/0406031
dc.identifierhttp://arxiv.org/abs/cond-mat/0406031
dc.identifierJ. Phys.: Condens. Matter 16, L279-L286 (2004)
dc.identifierdoi:10.1088/0953-8984/16/23/L01
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24083
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleUnusual conductance collapse in one-dimensional quantum structures
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