Creep Motion in Two-Dimensional Fully Frustrated Coulomb Gas Model

The creep motion in a two-dimensional fully frustrated square lattice Coulomb gas model with disorders is studied by using the Monte Carlo technique. The dependence of charge current density J on electric field E is investigated at low temperature T and at low E. The results show that the creep obeys the Arrhenius law J ～ C(T) exp -U(E)/T. The prefactor C(T) increases with the temperature in a power law relation with an exponent about 3.0. The energy barrier U(E) increases logarithmically with E_c/E as U(E) ～ U₀ln (E_c/E) with E_c being the critical field at zero temperature.