Thursday, August 1, 2013

1307.8258 (D. M. Basko et al.)

Disordered Josephson junction chains: Anderson localization of normal
modes and impedance fluctuations

D. M. Basko, F. W. J. Hekking
We study the properties of the normal modes of a chain of Josephson junctions in the simultaneous presence of disorder and absorption. We consider the superconducting regime of small phase fluctuations and focus on the case where the effects of disorder and absorption can be treated additively. We analyze the frequency shift and the localization length of the modes. We also calculate the distribution of the frequency-dependent impedance of the chain. The distribution is Gaussian if the localization length is long compared to the absorption length; it has a power law tail in the opposite limit.
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