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We employ Monte Carlo simulations to investigate the non-equilibriumrelaxation properties of the two- and three-dimensional Coulomb glass withdifferent long-range repulsive interactions. Specifically, we explore the agingscaling laws in the two-time density autocorrelation function. We find that inthe time window and parameter range accessible to us, the scaling exponents arenot universal, depending on the filling fraction and temperature: As either thetemperature decreases or the filling fraction deviates more from half-filling,the exponents reflect markedly slower relaxation kinetics. In comparison with arepulsive Coulomb potential, appropriate for impurity states in stronglydisordered semiconductors, we observe that for logarithmic interactions, thesoft pseudo-gap in the density of states is considerably broader, and thedependence of the scaling exponents on external parameters is much weaker. Thelatter situation is relevant for flux creep in the disorder-dominated Boseglass phase of type-II superconductors subject to columnar pinning centers.

Non-equilibrium Relaxation and Aging Scaling of the Coulomb and Bose Glass