TITLE

Possible microscopic origin of large broadening parameter in point Andreev reflection spectroscopy

AUTHOR(S)
Jian Wei; Sheet, Goutam; Chandrasekhar, Venkat
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/9/2010, Vol. 97 Issue 6, p062507
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the low frequency noise in ballistic point-contacts between a silver tip and a niobium foil. The ballistic nature is confirmed by point-contact Andreev reflection (PCAR) spectroscopy. As has been found by others, a broadening parameter Γ needs to be introduced to fit the PCAR spectra. For contacts with higher resistance, a larger Γ is required to fit the PCAR spectra and we find that random two level fluctuations dominate the noise spectra. This finding suggests that two level fluctuations contribute to the broadening of the gap features.
ACCESSION #
52929549

 

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