Subgap current in superconducting tunnel junctions with diffusive electrodes
Artikel i vetenskaplig tidskrift, 2006

We calculate subgap current in planar superconducting tunnel junctions with thin-film diffusive leads. It is found that the subharmonic gap structure of the tunnel current scales with an effective tunneling transparency which may exceed the junction transparency by up to two orders of magnitude depending on the junction geometry, and the ratio between the coherence length and the elastic scattering length. These results provide an alternative explanation of anomalously high values of the subgap current in tunnelling experiments often ascribed to imperfectness of the insulating layer. We also discuss the effect of finite lifetime of quasiparticles as the possible origin of additional enhancement of multiparticle tunnel currents.

Författare

Eugene Bezugly

Institute for Low Temperature Physics and Engineering

Andrey Vasenko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Ekaterina Bratus'

Institute for Low Temperature Physics and Engineering

Vitaly Shumeiko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Göran Wendin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review B - Condensed Matter and Materials Physics

0163-1829 (ISSN)

Vol. 73 220506

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.73.220506

Mer information

Senast uppdaterat

2018-09-07