An. Grib et Sv. Kuplevakhsky, SUBGAP EXCITATIONS IN AN IRREGULAR SUPERCONDUCTING S I SUPERLATTICE IN THE CURRENT-CARRYING STATE/, Czechoslovak journal of Physics, 46, 1996, pp. 581-582
The spectrum of a superconductor/insulator superlattice in the current
-carrying state in the case when one barrier potential is different fr
om the others has been studied. The presence of a defect leads to a lo
calized quasiparticle state displaced from the band. The energy of thi
s state is expressed in terms of the tunneling probability of the defe
ctive barrier and supercurrent.