Nonequilibrium Transitions in Fully Frustrated Josephson Junction Arrays

VERONICA I. MARCONI; DANIEL DOMINGUEZ

PHYSICAL REVIEW LETTERS

The American Physical Society

Año: 2001 vol. 87 p. 170041 - 170044

0031-9007

We study the effect of thermal fluctuationsin  a  fully frustratedJosephson junction array driven by a current $I$ larger thanthe apparent critical current $I_c(T)$. We calculate numerically the behavior of the chiral order parameter of $Z_2$symmetry and the transverse helicity modulus (related to the$U(1)$ symmetry) as a function oftemperature. We find that the $Z_2$ transition occurs at a temperature$T_{Z_2}(I)$ which is lower than the temperature $T_{U(1)}(I)$ forthe $U(1)$ transition. Both transitions could beobserved experimentally from measurements of thelongitudinal and transverse voltages.