Quench dynamics of an ultracold two-dimensional Bose gas

Abstract

We study the dynamics of a two-dimensional Bose gas after an instantaneous quench of an initially ultracold thermal atomic gas across the Berezinskii-Kosterlitz-Thouless phase transition, confirming via stochastic simulations that the system undergoes phase ordering kinetics and fulfills dynamical scaling hypothesis at late-time dynamics. Specifically, we find in that regime the vortex number decaying in time as $⟨N_v\propto t^{-1}⟩$, consistent with a dynamical critical exponent $z\approx 2$ for both temperature and interaction quenches. Focusing on finite-size box-like geometries, we demonstrate that such an observation is within current experimental reach.

arXiv commentMain text: 9 pages, 4 figures + References

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• Persistent current formation in double-ring geometries
• Superflow decay in a toroidal Bose gas: The effect of quantum and thermal fluctuations
• Soliton trains after interaction quenches in Bose mixtures
• Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas
• Finite temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture
• A damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate
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• Quantum kinetics of quenched two-dimensional Bose superfluids
• Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition
• Kibble-Zurek scaling of the superfluid-supersolid transition in an elongated dipolar gas
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• Equilibrium, Relaxation and Fluctuations in homogeneous Bose-Einstein Condensates: Linearized Classical Field Analysis
• Coarsening of binary Bose superfluids: an effective theory
• Dynamical localization of interacting ultracold atoms in one-dimensional quasi-periodic potentials