EPL is available also on-line on www.epljournal.org
Issue Europhys. Lett.
Volume 62, Number 1, April 2003
Page(s) 35 - 41
Section General
DOI http://dx.doi.org/10.1209/epl/i2003-00360-9
Published online 01 March 2003

DOI: 10.1209/epl/i2003-00360-9
Europhys. Lett., 62 (1) , pp. 35-41 (2003)

Elastic manifolds in disordered environments: Energy statistics

K. P. J. Kytölä1, E. T. Seppälä2 and M. J. Alava1

1  Helsinki University of Technology, Laboratory of Physics P.O. Box 1100, FIN-02015 HUT, Finland
2  Lawrence Livermore National Laboratory - 7000 East Avenue, L-415 Livermore, CA 94550, USA


(Received 12 December 2002; accepted in final form 30 January 2003)

Abstract
The energy of an elastic manifold in a random landscape at T=0 is shown numerically to obey a probability distribution that depends on the size of the box it is put into. If the extent of the spatial fluctuations of the manifold is much less than that of the system, a crossover takes place to the Gumbel distribution of extreme statistics. If they are comparable, the distributions have non-Gaussian, stretched exponential tails. The low-energy and high-energy stretching exponents are roughly independent of the internal dimension and the fluctuation degrees of freedom.

PACS
05.70.Np - Interface and surface thermodynamics.
75.50.Lk - Spin glasses and other random magnets.
68.35.Ct - Interface structure and roughness.

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