Non-equilibrium phase diagram in fully frustrated Josephson junction arrays

VERONICA I. MARCONI; DANIEL DOMINGUEZ

PHYSICA STATUS SOLIDI B-BASIC RESEARCH

Wiley-VCH

Año: 2002 vol. 230 p. 511 - 515

0370-1972

We study non-equilibrium phase transitions at finite temperature in  a  fullyfrustrated Josephson junction array driven by a uniform current. We calculatethe chiral order parameter of $Z_2$symmetry and the transverse helicity modulus (related to the $U(1)$ symmetry)as a function of temperature. For large currents we find that the $Z_2$transition occurs at a temperature $T_{Z_2}(I)$ which is lower than thetemperature $T_{U(1)}(I)$ for the $U(1)$ transition. Both transitions could beobserved experimentally from measurements of the longitudinal and transversevoltages.