Giuseppe Carleo, Federico Becca, Marco Schiró, Michele Fabrizio
When classical systems fail to explore their entire configurational space,
intriguing macroscopic phenomena like aging and glass formation may emerge.
Also closed quanto-mechanical systems may stop wandering freely around the
whole Hilbert space, even if they are initially prepared into a macroscopically
large combination of eigenstates. Here, we report numerical evidences that the
dynamics of strongly interacting lattice bosons driven sufficiently far from
equilibrium can be trapped into extremely long-lived inhomogeneous metastable
states. The slowing down of incoherent density excitations above a threshold
energy, much reminiscent of a dynamical arrest on the verge of a glass
transition, is identified as the key feature of this phenomenon. We argue that
the resulting long-lived inhomogeneities are responsible for the lack of
thermalization observed in large systems. Such a rich phenomenology could be
experimentally uncovered upon probing the out-of-equilibrium dynamics of
conveniently prepared quantum states of trapped cold atoms which we hereby
suggest.
View original:
http://arxiv.org/abs/1109.2516
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