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Emerging Quantum Order in an Expanding Gas

Lev Vidmar, J. P. Ronzheimer, Michael Schreiber, С. Браун, Sean S. Hodgman, S. Langer, Fabian Heidrich‐Meisner, Immanuel Bloch, Ulrich Schneider

Published Jan 1, 2015• 0 citations
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Long-range order in quantum many-body systems is usually associated with equilibrium situations.Here, we experimentally investigate the quasicondensation of strongly interacting bosons at finite momenta in a far-from-equilibrium case.We prepare an inhomogeneous initial state consisting of one-dimensional Mott insulators in the center of otherwise empty one-dimensional chains in an optical lattice with a lattice constant d.After suddenly quenching the trapping potential to zero, we observe the onset of coherence in spontaneously forming quasicondensates in the lattice.Remarkably, the emerging phase order differs from the ground-state order and is characterized by peaks at finite momenta Æðπ=2Þðℏ=dÞ in the momentum distribution function.

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Long-range order in quantum many-body systems is usually associated with equilibrium situations.Here, we experimentally investigate the quasicondensation of strongly interacting bosons at finite momenta in a far-from-equilibrium case.We prepare an inhomogeneous initial state consisting of one-dimensional Mott insulators in the center of otherwise empty one-dimensional chains in an optical lattice with a lattice constant d.After suddenly quenching the trapping potential to zero, we observe the onset of coherence in spontaneously forming quasicondensates in the lattice.Remarkably, the emerging phase order differs from the ground-state order and is characterized by peaks at finite momenta Æðπ=2Þðℏ=dÞ in the momentum distribution function.