Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 12: Ultra-cold atoms, ions and BEC

A 12.7: Poster

Dienstag, 12. März 2019, 16:30–18:30, S Fobau Physik

Quench dynamics in Rydberg dressed Bose gases — •Gary McCormack and Weibin Li — School of Physics and Astronomy, and Centre for the Mathematics and Theoretical Physics of Quantum Non-Equilibrium Systems, University of Nottingham, NG7 2RD, UK

We study the dynamics of three-dimensional Bose Gases in which interactions between atoms are changed by suddenly turning on a detuned laser, coupling the ground state to a Rydberg state. This dressing laser induces an isotropic, long-range interaction between ground state atoms. Using a self-consistent Bogoliubov approach, we numerically investigate dynamical responses of a Bose-Einstein condensate (BEC) to the interaction quench. We find that large momentum states can be excited significantly, which goes beyond the linear dispersion regime. Our self-consistent calculations show that quantum depletion exhibits persistent oscillations even at large times, and its asymptotic value is increased largely when compared to situations of weakly interacting BECs. We show that the dynamical evolution of density-density correlations and number fluctuations depends strongly on the strengths and shapes of the induced long-range interaction.