Anomalies in the conduction edge of quantum wires
Abstract
We study the conductance threshold of clean nearly straight quantum wires in which an electron is bound. We show that such a system exhibits spin-dependent conductance structures on the rising edge to the first conductance plateau, one near 0.25(2e^2/h), related to a singlet resonance, and one near 0.75(2e^2/h), related to a triplet resonance. As a quantitative example we solve exactly the scattering problem for two-electrons in a wire with circular cross-section and a weak bulge. From the scattering matrix we determine conductance via the Landauer-Buettiker formalism. The conductance anomalies are robust and survive to temperatures of a few degrees. With increasing magnetic field the conductance exhibits a plateau at e^2/h, consistent with recent experiments.
Keywords
Cite
@article{arxiv.cond-mat/0007419,
title = {Anomalies in the conduction edge of quantum wires},
author = {T. Rejec and A. Ramsak and J. H. Jefferson},
journal= {arXiv preprint arXiv:cond-mat/0007419},
year = {2007}
}
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