Voltage fluctuations on a superconductor grain attached to a quantum wire
Masaki Oshikawa, Alexandre M. Zagoskin
Abstract
When a finite superconductor is in contact with a 1D normal conductor, superconducting phase fluctuations lead to power-law response of the normal subsystem. As a result, the charge fluctuations on the superconductor at zero temperature have logarithmic correlator and a 1/ωpower spectrum (1/f-noise). At higher temperatures 1/ωis pushed to the high frequency region, and 1/ω2 behavior prevails.
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