Strong long-range interactions fragment the spectrum into energy bands; the paper shows prethermal plateaus arise from interband/intraband timescale separation, proves a bound on their lifetime, and formulates a band-resolved fragmented eigenstate thermalization hypothesis (fETH).
Arrufat-Vicente, D
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Fragmented ETH: Prethermalization, Timescales, and Ensemble Inequivalence
Strong long-range interactions fragment the spectrum into energy bands; the paper shows prethermal plateaus arise from interband/intraband timescale separation, proves a bound on their lifetime, and formulates a band-resolved fragmented eigenstate thermalization hypothesis (fETH).