Abstract
The bifurcation of the electron system in a quantum wire has been observed in the form of the suppression and disappearance of the quantised conductance plateau at 2 e 2 / h . We now present low-temperature transport measurements of a top-gated split-gate quantum wire that serve to further characterise this double-row régime of transport. A small distortion of the confinement caused by asymmetrical biasing of the split gates gives rise to a radical change in the conductance characteristics of the wire, beginning with the introduction of a plateau at G = e 2 / h which rises to around 0.7 × 2 e 2 / h with greater differential bias between the split gates. DC source–drain bias measurements in this régime show a split zero-bias peak at low conductances merging into a single peak around G = 0.7 × e 2 / h , which then persists up to the plateau at 4 e 2 / h .
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