The Feingold-Peres few-body chaotic model is shown numerically to obey ETH with hbar_eff^{1/2} diagonal fluctuations and to exhibit unitary-invariant-ensemble behavior of truncated operators only in the chaotic regime.
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Eigenstate Thermalization Hypothesis and Random Matrix Theory Universality in Few-Body Systems
The Feingold-Peres few-body chaotic model is shown numerically to obey ETH with hbar_eff^{1/2} diagonal fluctuations and to exhibit unitary-invariant-ensemble behavior of truncated operators only in the chaotic regime.