Conductance anomalies in quantum wires
Mesoscale and Nanoscale Physics
2009-10-31 v1
Abstract
We study the conductance threshold of clean nearly straight quantum wires in the magnetic field. As a quantitative example we solve exactly the scattering problem for two-electrons in a wire with planar geometry and a weak bulge. From the scattering matrix we determine conductance via the Landauer-Buettiker formalism. The conductance anomalies found near 0.25(2e^2/h) and 0.75(2e^2/h) are related to a singlet resonance and a triplet resonance, respectively, and survive to temperatures of a few degrees. With increasing in-plane magnetic field the conductance exhibits a plateau at e^2/h, consistent with recent experiments.
Cite
@article{arxiv.cond-mat/0008271,
title = {Conductance anomalies in quantum wires},
author = {T. Rejec and A. Ramsak and J. H. Jefferson},
journal= {arXiv preprint arXiv:cond-mat/0008271},
year = {2009}
}
Comments
Quantum wire with planar geometry; in-plane magnetic field