Non-equilibrium transitions in fully frustrated Josephson junction arrays
Abstract
We study the effect of thermal fluctuations in a fully frustrated Josephson junction array driven by a current I larger than the apparent critical current Ic(T). We calculate numerically the behavior of the chiral order parameter of Z2 symmetry and the transverse helicity modulus (related to the U(1) symmetry) as a function of temperature. We find that the Z2 transition occurs at a temperature TZ2(I) which is lower than the temperature TU(1)(I) for the U(1) transition. Both transitions could be observed experimentally from measurements of the longitudinal and transverse voltages.
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