Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Many-body Systems: Equilibration, Chaos, and Localization (joint session DY/TT)
TT 45.4: Talk
Wednesday, March 11, 2026, 10:15–10:30, HÜL/S186
Timescales for Deep and Full Thermalization — •Tabea Herrmann1, Felix Fritzsch2, and Arnd Bäcker1 — 1TU Dresden, Institut für Theoretische Physik, Dresden, Germany — 2Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
Isolated quantum systems typically approach thermal equilibrium as described by the Eigenstate Thermalization Hypothesis (ETH). Going beyond this involves either higher order correlators (full ETH) or the approach of moments of the reduced density matrix towards thermal equilibrium (deep thermalization). In this talk we compare these two types of thermalization using extensive numerical studies within a paradigmatic model for chaotic many-body quantum dynamics. For this we find exponential relaxation for both types: For deep thermalization all moments relax with the same rate, which approximately equals the relaxation rate of two-point correlation functions within full ETH. In contrast, all higher order correlation functions approach equilibrium twice as fast.
Keywords: Thermalization; ETH; Floquet system; Kicked spin chain; Many body quantum chaos