Universal conductance reduction in a quantum wire

Details Universal conductance reduction in a quantum wire Universal conductance reduction in a quantum wire

2003-03-18

arxiv.org/abs/cond-mat/0303347v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures (Revtex)

Scientific paper

10.1209/epl/i2004-10285-3

Even a single point defect in a quantum wire causes a conductance reduction. In this paper we prove (without any approximations) that for any point impurity this conductance reduction in all the sub-bands is exactly 2e^2/h. Moreover, it is shown that in the case of a surface defect, not only is the conductance minimum independent of the defect characteristics, but the transmission matrix also converges to universal (defect-independent) values. We also discuss particle confinement between two arbitrarily weak point defects.

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