Pairing of Cooper Pairs in a Fully Frustrated Josephson Junction Chain

Abstract

We study a one-dimensional Josephson junction chain embedded in a magnetic field. We show that when the magnetic flux per elementary loop equals half the superconducting flux quantum ${\varphi }_0=h/2e$, a local $\nbZ_2$ symmetry arises. This symmetry is responsible for a nematic Luttinger liquid state associated to bound states of Cooper pairs. We analyze the phase diagram and we discuss some experimental possibilities to observe this exotic phase.

arXiv comment4 pages, 4 EPS figures

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