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It is well known that while forward scattering has no effect on theconductance of one-dimensional systems, backscattering off a static impuritysuppresses the current. We study the effect of a time-dependent point impurityon the conductance of a one-channel quantum wire. At strong repulsiveinteraction (Luttinger liquid parameter g<1/2), backscattering renders thelinear conductance greater than its value e^2/h in the absence of the impurity.A possible experimental realization of our model is a constricted quantum wireor a constricted Hall bar at fractional filling factors nu=1/(2n+1) with atime-dependent voltage at the constriction.Comment: 7 pages, 2 figure

physical review. b, condensed matter

Backscattering off a point impurity: Current enhancement and conductance greater than<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>/</mml:mo><mml:mi>h</mml:mi></mml:math>per channel

Backscattering off a point impurity: Current enhancement and conductance greater thane2/hper channel