Genway, S., Ho, A. F. and Lee, D. K. K. (2010) Dynamics of Thermalization in Small Hubbard-Model Systems. Physical Review Letters, 105 (26).
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We study numerically the thermalization and temporal evolution of a two-site subsystem of a fermionic Hubbard model prepared far from equilibrium at a definite energy. Even for very small systems near quantum degeneracy, the subsystem can reach a steady state resembling equilibrium. This occurs for a nonperturbative coupling between the subsystem and the rest of the lattice where relaxation to equilibrium is Gaussian in time, in sharp contrast to perturbative results. We find similar results for random couplings, suggesting such behavior is generic for small systems.
This is a Approved version This version's date is: 28/12/2010 This item is not peer reviewed
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