Superconducting & mesoscopic structures

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Nonequilibrium charge transport in mesoscopic superconducting structures
The concept of multiple Andreev reflections is a universal framework explaining the nature of dissipative current in different types of Josephson junctions. Within this approach, we are study-ing theoretically the current-voltage characteristics of a planar multichannel SNINS junction which models the Josephson field-effect transistor (JOFET) with the 2D electron gas as a normal connector (N) between superconducting (S) electrodes, affected by the controlling gate playing the role of a tunnel barrier (I). We suggest that the resonant features of the dc current are associ-ated with the Andreev levels positions which thus can be measured in the experiment.
We are studying theoretically the dynamics of phase-slip centers (PSC) and lines (PSL) in super-conducting wires and strips, by numerical simulation based on full time-dependent Ginsburg-Landau equations (TDGLE) for superconductors with the energy gap in their spectrum. We are focused on the process of emerging of multiple PSCs, as well as on the clarification of the nature of the excess current and its relation to the averaged supercurrent through the PSC core. Our future goal is to verify the results of Ivlev-Kopnin’s asymptotical analysis of TDGLE and to investigate the role of defects and boundary conditions at the electrodes.
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