1996/10/24 by G. B. Lesovik, A. L. Fauchère, A. L. Fauch`ere +1 · 3 citations
Engineering · Physics and Astronomy · #Andreev reflection #Condensed matter physics #Conductance #Materials science #Matrix (chemical analysis) #Molecular Junctions and Nanostructures #Nonlinear system #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Superconductivity #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.55.3146
published as Phys. Rev. B 55, 3146 (1997). · 26 pages, 4 Postscript figures, Latex, to be published in Phys. Rev. B
arxiv created 1996/10/24 · openalex publication_date 1997/02/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A general formula for the current through a disordered normal-superconducting junction is derived, which is valid at finite temperature and includes the full voltage dependence. The result depends on a multichannel scattering matrix, which describes elastic scattering in the normal region, and accounts for the Andreev scattering at the normal-metal--superconductor interface. The symmetry of the current with respect to sign reversal in the subgap regime is discussed. The Andreev approximation is used to derive a spectral conductance formula, which applies to voltages both below and above the gap. In a case study the spectral conductance formula is applied to the problem of a normal-metal--insulator--normal-metal--insulator--superconductor double barrier junction.