Backscattering off a point impurity: Current enhancement and conductance greater than e(2)/h per channel

Article

关键词: QUANTUM HALL REGIME;    LUTTINGER LIQUID;    TRANSPORT;    PHYSICS;    STATES;    NOISE;   

DOI  :  10.1103/PhysRevB.67.115337

来源: SCIE

【 摘 要 】

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 linear 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 wire or a constricted Hall bar at fractional filling factors nu=1/(2n+1) with a time-dependent voltage at the constriction.

【 授权许可】

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