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We study the level spacing statistics P (s) in many-body Fermi systems and determine a critical two-body interaction strength U₂ at which a crossover from Poisson to Wigner-Dyson statistics takes place. Near the Fermi level, the results allow one to find a critical temperature T₂₇ above which quantum chaos and thermalization set in.
Jacquod et al. (Mon,) studied this question.
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