Dynamics below the Depinning Threshold in Disordered Elastic Systems

ALEJANDRO B. KOLTON, ALBERTO ROSSO, THIERRY GIAMARCHI, AND WERNER KRAUTH

PHYSICAL REVIEW LETTERS

The American Physical Society

Lugar: USA; Año: 2006 vol. 97 p. 57001 - 57005

0031-9007

We study the steady-state low-temperature dynamics of an elastic line in a disordered medium below the depinning threshold. Analogously to the equilibrium dynamics, in the limit T0, the steady state is dominated by a single configuration which is occupied with probability 1. We develop an exact algorithm to target this dominant configuration and to analyze its geometrical properties as a function of the driving force. The roughness exponent of the line at large scales is identical to the one at depinning. No length scale diverges in the steady-state regime as the depinning threshold is approached from below. We do find a divergent length, but it is associated only with the transient relaxation between metastable states.