Identification of Coulomb blockade and macroscopic quantum tunneling by noise

Details Identification of Coulomb blockade and macroscopic quantum tunneling by noise Identification of Coulomb blockade and macroscopic quantum tunneling by noise

2002-02-26

arxiv.org/abs/cond-mat/0202460v1

Europhys. Lett. 58, 429 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures, epl.cls included

Scientific paper

10.1209/epl/i2002-00657-1

The effects of Macroscopic Quantum Tunneling (MQT) and Coulomb Blockade (CB) in Josephson junctions are of considerable significance both for the manifestations of quantum mechanics on the macroscopic scale and potential technological applications. These two complementary effects are shown to be clearly distinguishable from the associated noise spectra. The current noise is determined exactly and a rather sharp crossover between flux noise in the MQT and charge noise in the CB regions is found as the applied voltage is changed. Related results hold for the voltage noise in current-biased junctions.

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