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Pairing of Cooper Pairs in a Fully Frustrated Josephson Junction Chain

B. Doucot·J. Vidal
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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 $ϕ_0=h/2e$, 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.

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B. Doucot, J. Vidal. 2002-02-14. Pairing of Cooper Pairs in a Fully Frustrated Josephson Junction Chain. https://doi.org/10.1103/physrevlett.88.227005

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