Can backscattering off an impurity enhance the current?
Mesoscale and Nanoscale Physics
2007-05-23 v1 Strongly Correlated Electrons
Abstract
It is well known that while forward scattering has no effect on the conductance of one-dimensional systems, backscattering off a static impurity suppresses the current. We study the effect of a time-dependent point impurity on the conductance of a one-channel quantum wire. At strong repulsive interaction (Luttinger liquid parameter g<1/2), backscattering renders the conductance greater than its value e^2/h in the absence of the impurity. A possible experimental realization of our model is a constricted Hall bar at fractional filling factors \nu=1/(2n+1) with a time-dependent voltage at the constriction.
Cite
@article{arxiv.cond-mat/0104558,
title = {Can backscattering off an impurity enhance the current?},
author = {D. E. Feldman and Yuval Gefen},
journal= {arXiv preprint arXiv:cond-mat/0104558},
year = {2007}
}
Comments
5 pages, Revtex