Dynamics below the depinning threshold in disordered elastic systems.
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 T-->0, 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.
Kolton
Alejandro B
AB
DPMC-MaNEP University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland.
Rosso
Alberto
A
Giamarchi
Thierry
T
Krauth
Werner
W