Can backscattering off an impurity enhance the current?

Details Can backscattering off an impurity enhance the current? Can backscattering off an impurity enhance the current?

2001-04-28

arxiv.org/abs/cond-mat/0104558v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, Revtex

Scientific paper

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.

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