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Quench dynamics and nonequilibrium phase diagram of the bose-hubbard model
Corinna Kollath1, Andreas M Läuchli, Ehud Altman
1Université de Genève, 24 Quai Ernest-Ansermet, CH-1211 Genève, Switzerland.
Abstract:
We investigate the time evolution of correlations in the Bose-Hubbard model following a quench from the superfluid to the Mott insulator. For large values of the final interaction strength the system approaches a distinctly nonequilibrium steady state that bears strong memory of the initial conditions. In contrast, when the final interaction strength is comparable to the hopping, the correlations are rather well approximated by those at thermal equilibrium. The existence of two distinct nonequilibrium regimes is surprising given the nonintegrability of the Bose-Hubbard model. We relate this phenomenon to the role of quasiparticle interactions in the Mott insulator.
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