Thermal noise in superconducting quantum point-contacts
Condensed Matter
2009-10-28 v1
Abstract
We present a theory for the frequency-dependent current fluctuations in superconducting quantum point-contacts (SQPC) within the dc transport regime. This theory is valid for any barrier transparency between the tunnel and ballistic limits, yielding an analytical expression for the fluctuations spectrum in the subgap region. It is shown that the level of noise in a quasi-ballistic SQPC may have a huge increase in comparison with the case of a normal contact carrying the same average current. The effect of this high level of noise on the actual observability of the current-phase relation for a ballistic point-contact is discussed in connection with recent experimental measurements.
Keywords
Cite
@article{arxiv.cond-mat/9512031,
title = {Thermal noise in superconducting quantum point-contacts},
author = {A. Martin-Rodero and A. Levy Yeyati and F. J. Garcia-Vidal},
journal= {arXiv preprint arXiv:cond-mat/9512031},
year = {2009}
}
Comments
11 pages, REVTEX, including 2 Postscript figures