Volume 68, Number 6, December 2004
|Page(s)||860 - 866|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||17 November 2004|
Universal conductance reduction in a quantum wire
Department of Electrical and Electronics Engineering, College of Judea and Samaria Ariel 44837, Israel
Corresponding author: email@example.com
Accepted: 19 October 2004
A single impurity in a quantum wire exhibits a conductance reduction. In this paper we prove (without any approximations) that for any point impurity this conduction reduction in all the subbands is exactly . It is also shown that in the case of a surface defect, not only are the conductance minima independent of the defect characteristics, but also the transmission matrix converges to universal values. We use these calculations to discuss particle confinement between two arbitrarily weak point defects.
PACS: 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect) / 03.65.Nk – Scattering theory / 73.21.Hb – Quantum wires
© EDP Sciences, 2004
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