title: Quantum quenches in disordered systems: approach to thermal equilibrium without a typical relaxation time.
abstract: We study spectral properties and the dynamics after a quench of one-dimensional spinless fermions with short-range interactions and long-range random hopping. We show that a sufficiently fast decay of the hopping term promotes localization effects at finite temperature, which prevents thermalization even if the classical motion is chaotic. For slower decays, we find that thermalization does occur. However, within this model, the latter regime falls in an unexpected universality class, namely, observables exhibit a power-law (as opposed to an exponential) approach to their thermal expectation values.
authors.affiliation: Department of Physics, Georgetown University, Washington, D.C. 20057, USA.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Khatami
authors.forename: Marcos
authors.initials: M
authors.lastname: Rigol
authors.forename: Armando
authors.initials: A
authors.lastname: Relaño
authors.forename: Antonio M
authors.initials: AM
authors.lastname: García-García