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Subgap current in superconducting tunnel junctions with diffusive electrodes

Eugene Bezugly ; Andrey Vasenko (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Ekaterina Bratus' ; Vitaly Shumeiko (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Göran Wendin (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik)
Phys. Rev. B Vol. 73 (2006), p. 220506.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2006-11-01. Senast ändrad 2010-07-20.
CPL Pubid: 23002

 

Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik

Ämnesområden

Supraledning

Chalmers infrastruktur