Impurity-induced coherent current oscillations in one-dimensional conductors

摘要

The electronic transport through a single impurity in a repulsive Luttinger liquid (LL) has been theoretically studied. It has been found that the direct current (I) over bar above the threshold voltage related to the strength of the impurity potential is accompanied by coherent oscillations with frequency f= (I) over bar /e. There is an analogy with the Josephson junctions: the well-known regime of the power-law I-V curves in the LL corresponds to the damping of the Josephson current below the critical one, while the oscillatory regime in the LL can be compared with the Josephson oscillations above the critical current.