Europhys. Lett.
Volume 61, Number 2, January 2003
Page(s) 221 - 227
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 January 2003
DOI: 10.1209/epl/i2003-00222-0
Europhys. Lett., 61 (2) , pp. 221-227 (2003)

Depinning and dynamics of systems with competing interactions in quenched disorder

C. Reichhardt, C. J. Olson, I. Martin and A. R. Bishop

Center for Nonlinear Studies, Theoretical Division and Applied Physics Division Los Alamos National Laboratory - Los Alamos, NM 87545, USA

(Received 2 July 2002; accepted in final form 11 November 2002)

We examine the depinning and driven dynamics of a system in which there is a competition between long-range Coulomb repulsive and short-range attractive interactions. In the absence of disorder, the system forms Wigner crystal, stripe and clump phases as the attractive interaction is increased. With quenched disorder, these phases are fragmented and there is a finite depinning threshold. The stripe phase is the most strongly pinned and shows hysteretic transport properties. At higher drives beyond depinning, a dynamical reordering transition occurs in all the phases, which is associated with a characteristic transport signature.

64.60.Cn - Order-disorder transformations; statistical mechanics of model systems.
73.20.Qt - Electron solids.
71.45.Lr - Charge-density-wave systems.

© EDP Sciences 2003