Conductance anomalies in quantum wires

Details Conductance anomalies in quantum wires Conductance anomalies in quantum wires

2000-08-18

arxiv.org/abs/cond-mat/0008271v1

J. Phys.: Condens. Matter 12 (2000) L233

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Quantum wire with planar geometry; in-plane magnetic field

Scientific paper

10.1088/0953-8984/12/13/101

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.

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