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4e-condensation in a fully frustrated Josephson junction diamond chain

M. Rizzi·V. Cataudella·R. Fazio
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Abstract

Fully frustrated one-dimensional diamond Josephson chains have been shown [B. Douçot and J. Vidal, Phys. Rev. Lett. {\bf 88}, 227005 (2002)] to posses a remarkable property: The superfluid phase occurs through the condensation of pairs of Cooper pairs. By means of Monte Carlo simulations we analyze quantitatively the Insulator to $4e$-Superfluid transition. We determine the location of the critical point and discuss the behaviour of the phase-phase correlators. For comparison we also present the case of a diamond chain at zero and 1/3 frustration where the standard $2e$-condensation is observed.

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M. Rizzi, V. Cataudella, R. Fazio. 2005-11-17. 4e-condensation in a fully frustrated Josephson junction diamond chain. https://doi.org/10.1103/physrevb.73.100502

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