Influence of phase quantum fluctuations on superconducting proximity correction in normal-metal wire conductance
Hayato Nakano, Hideaki Takayanagi
DOI 10.1103/PhysRevB.61.15398 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The influence of the charging effect on the proximity correction in the conductance of a mesoscopic superconductor(S)/normal−metal(N) coupled system is theoretically investigated. The most important contribution of the proximity correction in the conductance of a diffusive normal metal comes from the correction in the local conductivity δσ(r). The correction in the conductance is given by δG=(1/LN2)∫vol.δσ(r)dr. Because of the retro property of Andreev reflection and the long rangeness of the Cooperon (particle-particle ladder), Andreev reflection at the S/N interface affects the local conductivity at a point in the normal region far from the interface (within the phase coherence length Lφ). If the S/N interface is very small and has a low transparency, single Andreev reflection is strongly suppressed by the Coulomb blockade at a low temperature (kBT<EC, EC=e2/2C) in an exponential manner exp{−4EC/(kBT)}, where C is the capacitance of the S/N junction. Nevertheless, the proximity correction in the conductance is only suppressed with power law kBT/(4EC) because the charged state is an intermediate state in the process of the proximity correction in the conductivity. This is quite different from the charging effect on the proximity correction of the current flowing through the S/N interface, which is strongly suppressed by the charging effect.
Similar papers
Long-range phase-coherent effects in the transport properties of mesoscopic superconductor–normal-metal structures
similarity 0.90Anatoly F. Volkov & Hideaki Takayanagi
Source status unknown — claims are unverified
Phase-coherent conductance of a superconductor-normal-metal quantum interferometer
similarity 0.89A. F. Volkov & A. V. Zaitsev
Source status unknown — claims are unverified
Resonant proximity effect in normal metal/diffusive ferromagnet/superconductor junctions
similarity 0.89T. Yokoyama et al.
Source status unknown — claims are unverified
Proximity effect and multiple Andreev reflections in diffusive superconductor–normal-metal–superconductor junctions
similarity 0.89J. C. Cuevas et al.
Source status unknown — claims are unverified
Proximity Effect and Multiple Andreev Reflections in Diffusive SNS Junctions
similarity 0.88J. C. Cuevas et al. · 2005 · arXiv:cond-mat/0507247
Source status unknown — claims are unverified
Phase-dependent energy spectrum of quasiparticles in a superconducting superlattice
similarity 0.88Yukio Tanaka & Masaru Tsukada
Source status unknown — claims are unverified