The phase diagram of quantum disordered superconducting networks

I review the low energy dynamics and the phase diagram of two parallel coupled Josephson junction arrays (JJA) in the presence of charge and magnetic frustration. Starting from the quantum phase model known to capture the relevant physics of JJA, the system is mapped in the self-dual limit into an A...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-03, Vol.150 (4), p.042170
Main Author: Sakhi, S
Format: Article
Language:English
Subjects:
Coherence
Cooper pairs
Gauge theory
Interlayers
Josephson junctions
Measurement
Phase diagrams
Physics
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Summary:I review the low energy dynamics and the phase diagram of two parallel coupled Josephson junction arrays (JJA) in the presence of charge and magnetic frustration. Starting from the quantum phase model known to capture the relevant physics of JJA, the system is mapped in the self-dual limit into an Abelian gauge theory with a mixed Chern-Simons term. The low energy dynamics is shown to be governed by Higgs fields associated with disordering effects due to electric charges and magnetic excitations minimally coupled to gauge fields related to the currents of Cooper pairs and vortices. A rich phase diagram not attainable by standard mean field theories emerges as a result of the condensation of disorder fields. The interplay between Hall quantization and interlayer coherence displays appealing features resulting into quantized Hall states coexisting with interlayer coherence, quantized Hall states without interlayer coherence, and interlayer coherent states without Hall quantization.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/4/042170