The phase-dependent linear conductance of a superconducting quantum point contact
Abstract
The exact expression for the phase-dependent linear conductance of a weakly damped superconducting quantum point contact is obtained. The calculation is performed by summing up the complete perturbative series in the coupling between the electrodes. The failure of any finite order perturbative expansion in the limit of small voltage and small quasi-particle damping is analyzed in detail. In the low transmission regime this nonperturbative calculation yields a result which is at variance with standard tunnel theory. Our result predicts the correct sign of the quasi-particle pair interference term and exhibits an unusual phase-dependence at low temperatures in qualitative agreement with the available experimental data.
Keywords
Cite
@article{arxiv.cond-mat/9505102,
title = {The phase-dependent linear conductance of a superconducting quantum point contact},
author = {A. Levy Yeyati and A. Martín-Rodero and J. C. Cuevas},
journal= {arXiv preprint arXiv:cond-mat/9505102},
year = {2016}
}
Comments
12 pages (revtex) + 1 postscript figure. Submitted to Phys. Rev. Lett