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Magnetotransport in variable-coupling one-dimensional ballistic constrictions

Roddaro, Stefano ; Piazza, Vincenzo ; Beltram, Fabio ; Wegscheider, Werner ; Liang, Chi-Te ; Pepper, Michael
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Date of publication of this fulltext: 07 Dec 2009 13:22


A scheme to produce closely spaced high-quality one-dimensional electronic channels is presented. It is based on standard nanolithography fabrication applied to a single, wide quantum well AlGaAs/GaAs heterostructure where the spatial separation of the wire modes is given by Coulomb repulsion. The lack of a composition-induced barrier in the double layer leads to electron mobility of 5×106 cm2/Vs ...


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