Josephson-junction ladders and quantum fluctuations
Mehran Kardar
DOI 10.1103/PhysRevB.33.3125 · Physical Review B
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Abstract
A ladder of Josephson junctions provides a realization of the discrete sine-Gordon chain. The spring constant and incommensurability can be varied by the supercurrent and the magnetic field. As the magnetic field is increased there is a transition to a vortex state. Due to charging effects (quantum fluctuations) the ladder becomes normal in the vicinity of this transition.
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