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

Matteo Rizzi; Vittorio Cataudella; Rosario Fazio

doi:10.1103/PhysRevB.73.100502

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

Matteo Rizzi, Vittorio Cataudella, Rosario Fazio

DOI 10.1103/PhysRevB.73.100502 · Physical Review B

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Abstract

Fully frustrated one-dimensional diamond Josephson chains have been shown [B. Douçot and J. Vidal, Phys. Rev. Lett. 88, 227005 (2002)] to possess 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 behavior 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.