Nonequilibrium transitions in fully frustrated Josephson junction arrays -art. no. 017004

We study the effect of thermal fluctuations in a fully frustrated Josephson junction array driven by a current I larger than the apparent critical cur rent I-c(T). We calculate numerically the behavior of the chiral order para meter of Z(2) symmetry and the transverse helicity modulus [related to the U(1) symmetry] as a function of temperature. We find that the Z(2) transiti on occurs at a temperature T-Z 2,(I) which is lower than the temperature T- U(1)(I) for the U(I) transition. Both transitions could be observed experim entally from measurements of the longitudinal and transverse voltages.