Dynamics of correlations in a quasi-2D dipolar Bose gas following a quantum quench
arXiv:1401.0735 · doi:10.1103/PhysRevA.90.043617
Abstract
We study the evolution of correlations in a quasi-2D dipolar gas driven out-of-equilibrium by a sudden ramp of the interaction strength. For sufficiently strong ramps, the momentum distribution, excited fraction and density-density correlation function all display pronounced features that are directly related to the appearance of a roton minimum in the underlying spectrum. Our study suggests that the evolution of correlations following a quench can be used as a probe of roton-like excitations in a dipolar gas. We also find that the build up of density-density correlations following a quench occurs much more slowly in the dipolar gas compared to a non-dipolar gas, owing to the long-range interactions.
8 pages, 4 figures. Expanded to include self-consistent Bogoliubov ansatz. Significance of results to experiments discussed
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Cited by in corpus (15)
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- New states of matter with fine-tuned interactions: quantum droplets and dipolar supersolids
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