Physics – Quantum Physics
Scientific paper
2010-07-22
Phys. Rev. Lett. 106, 050405 (2011)
Physics
Quantum Physics
12 pages, 21 figures, including additional material
Scientific paper
10.1103/PhysRevLett.106.050405
When a non-integrable system evolves out of equilibrium for a long time, local observables are expected to attain stationary expectation values, independent of the details of the initial state. However, intriguing experimental results with ultracold gases have shown no thermalization in non-integrable settings, triggering an intense theoretical effort to decide the question. Here we show that the phenomenology of thermalization in a quantum system is much richer than its classical counterpart. Using a new numerical technique, we identify two distinct thermalization regimes, strong and weak, occurring for different initial states. Strong thermalization, intrinsically quantum, happens when instantaneous local expectation values converge to the thermal ones. Weak thermalization, well-known in classical systems, happens when local expectation values converge to the thermal ones only after time averaging. Remarkably, we find a third group of states showing no thermalization, neither strong nor weak, to the time scales one can reliably simulate.
Banuls Mari Carmen
Cirac Juan Ignacio
Hastings Matthew B.
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