Volume 67, Number 2, July 2004
|Page(s)||280 - 286|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 July 2004|
Overdamped quantum phase diffusion and charging effects in Josephson junctions
Physikalisches Institut, Albert-Ludwigs-Universität Freiburg Hermann-Herder-Straße 3, D-79104 Freiburg, Germany
Accepted: 13 May 2004
By exploiting the recently derived quantum Smoluchowski equation, the classical Ivanchenko-Zil'berman theory for overdamped diffusive phase motion of low-capacitance Josephson junctions is extended to the low-temperature quantum domain where charging effects appear. This formulation allows to derive explicit results for the current-voltage characteristics over a broad range of parameters that reduce to known findings in certain limits. In particular, the transparent analytical approach comprises Coulomb-blockade physics, coherent Cooper-pair transfer, and the precursors of macroscopic quantum tunneling and needs to be supplemented by more sophisticated methods only at very low temperatures.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 73.23.-b – Electronic transport in mesoscopic systems
© EDP Sciences, 2004
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