We study analytically and numerically the behaviour of charge density waves above the depinning transition. The system behaves as a complex self-organized object which reacts to the external stimulations by adapting itself in a marginally stable state, which gives rise to a power law distribution of avalanches. Critical exponents and current power spectrum are evaluated analytically in any dimension by means of a simple coarse grained model. Extensive simulations are performed in one-dimensional systems below and above threshold, to critically verify the question of universality of coarse grained models with respect to the original Hamiltonian.
CRITICAL EXPONENTS AND UNIVERSALITY IN PINNED CHARGE-DENSITY WAVES
CORBERI, Federico
1992-01-01
Abstract
We study analytically and numerically the behaviour of charge density waves above the depinning transition. The system behaves as a complex self-organized object which reacts to the external stimulations by adapting itself in a marginally stable state, which gives rise to a power law distribution of avalanches. Critical exponents and current power spectrum are evaluated analytically in any dimension by means of a simple coarse grained model. Extensive simulations are performed in one-dimensional systems below and above threshold, to critically verify the question of universality of coarse grained models with respect to the original Hamiltonian.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
