Microscopic Model of Critical Current Noise in Josephson Junctions

Details Microscopic Model of Critical Current Noise in Josephson Junctions Microscopic Model of Critical Current Noise in Josephson Junctions

2006-12-15

arxiv.org/abs/cond-mat/0612410v2

Phys. Rev. Lett. 99, 207001 (2007)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.207001

We present a simple microscopic model to show how fluctuating two--level systems in the 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 $L^5$. Our values are in good agreement with recent experimental measurements of critical current noise in Al/AlO$_{x}$/Al Josephson junctions. We also investigate the sensitivity of the noise on the nonuniformity of the tunnel barrier.

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