Quantum quench in an atomic one-dimensional Ising chain

Meinert, F. and Mark, M.J. and Kirilov, E. and Lauber, K. and Weinmann, P. and Daley, A.J. and Nägerl, H.-C. (2013) Quantum quench in an atomic one-dimensional Ising chain. Physical Review Letters, 111 (5). 053003. ISSN 0031-9007

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We study nonequilibrium dynamics for an ensemble of tilted one-dimensional atomic Bose-Hubbard chains after a sudden quench to the vicinity of the transition point of the Ising paramagnetic to antiferromagnetic quantum phase transition. The quench results in coherent oscillations for the orientation of effective Ising spins, detected via oscillations in the number of doubly occupied lattice sites. We characterize the quench by varying the system parameters. We report significant modification of the tunneling rate induced by interactions and show clear evidence for collective effects in the oscillatory response.