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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/3136985
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