Pairing of Cooper Pairs in a Fully Frustrated Josephson Junction Chain
B. Doucot, J. Vidal
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 ϕ0=h/2e, a local 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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