MATERIALS SCIENCE SEMINAR

ABSTRACT: The approach applicable for spatially inhomogeneous and time-dependent problems associated with the induced superconductivity in low-dimensional electronic systems is developed. We consider two types of junctions made of a ballistic two-dimensional electron gas placed in a tunnel finite-length contact with a bulk superconducting lead. We calculate the spectrum of the bound states, supercurrent, and the current-voltage curve which show a rich structure due to the presence of induced gap and dimensional quantization.
The induced superconducting gap is shown to affect strongly the electronic structure of vortex states. The quasiparticle bound states and the local density of states are analyzed for different models of tunneling between the two-dimensional system and superconducting electrode.