Microscopic model of critical current noise in Josephson junctions.
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.
Constantin
Magdalena
M
Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
Yu
Clare C
CC