Quantum fluctuations in finite size Josephson junctions

An effective Josephson coupling energy for a one-dimensional Josephson junction is renormalized due to quantum fluctuations of the phase difference. In a long junction at T → 0 a Kosterlitz-Thouless phase transition takes place. The state with a logarithmically divergent phase-phase correlation func...

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Bibliographic Details
Published in:Physics letters. A 1992-12, Vol.171 (5), p.403-407
Main Authors: Zaikin, A.D., Horovitz, B.
Format: Article
Language:English
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Summary:An effective Josephson coupling energy for a one-dimensional Josephson junction is renormalized due to quantum fluctuations of the phase difference. In a long junction at T → 0 a Kosterlitz-Thouless phase transition takes place. The state with a logarithmically divergent phase-phase correlation function shows a nontrivial combination of phase disorder on a junction surface with phase order in the bulk. For finite size junctions the renormalized value of the Josephson coupling energy turns out to be strongly suppressed for small Josephson-to-charging energy ratio. The implications of this effect for Bloch oscillations are discussed.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(92)90665-9