Simone Ziraldo, Alessandro Silva, Giuseppe E. Santoro
We study the unitary relaxation dynamics of disordered spin chains following a sudden quench of the Hamiltonian. We give analytical arguments, corroborated by specific numerical examples, to show that the existence of a stationary state depends crucially on the spectral and localization properties of the final Hamiltonian, and not on the initial state. We test these ideas on integrable one-dimensional models of the Ising/XY class, but argue more generally on their validity for more complex (non-integrable) models.
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http://arxiv.org/abs/1206.4787
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