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Dynamical Quasicondensation of Hard-Core Bosons at Finite Momenta

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  • UserUlrich Schneider (University of Cambridge; Ludwig-Maximilians-Universität München; Max-Planck-Institut für Quantenoptik )
  • ClockTuesday 12 January 2016, 10:00-11:00
  • HouseSeminar Room 1, Newton Institute.

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QIMW01 - Quantum integrable models in and out of equilibrium

We experimentally study the expansion of initially localized ultracold bosons in homogeneous optical lattices in real and momentum space and find that both dimensionality and interaction strength crucially influence these out-of-equilibrium dynamics. While the atoms expand ballistically in all integrable limits, deviations from these limits dramatically suppress the expansion and lead to the appearance of almost bimodal real-space density distributions. For strongly interacting bosons, we observe a dimensional crossover of the dynamics from ballistic in the one-dimensional hard-core case to diffusive in two dimensions, as well as a similar crossover when higher occupancies are introduced into the system. Studying the same expansion in momentum space, we observe the onset of quasicondensation of expanding hard-core bosons at finite momenta in a high energy far-from-equilibrium situation, even though long-range order is usually associated with low-temperature equilibrium situations. In particular, we observe the emergence of peaks at finite momenta that corresponds to the spontaneous formation of coherence with a phase order that differs from the ground-state order.

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