Phys. Rev. Lett. 99, 207001 (2007) [4 pages]Microscopic Model of Critical Current Noise in Josephson JunctionsReceived 14 December 2006; revised 17 May 2007; published 12 November 2007 We present a simple microscopic model to show how fluctuating two-level systems in a Josephson junction tunnel barrier of thickness L can modify the potential energy of the barrier and produce critical current noise spectra. We find low frequency 1/f noise that goes as L5. Our values are in good agreement with recent experimental measurements of critical current noise in Al/AlOx/Al Josephson junctions. We also investigate the sensitivity of the noise on the nonuniformity of the tunnel barrier. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.207001
DOI:
10.1103/PhysRevLett.99.207001
PACS:
74.50.+r, 74.25.Sv, 74.40.+k
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