Early-time dynamics of Bose gases quenched into the strongly interacting regime
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical SocietyDate
2019-02-21Citation
10.1103/PhysRevA.99.023623
Physical Review A 99.2 (2019): 023623
ISSN
2469-9926 (print); 2469-9934 (online)DOI
10.1103/PhysRevA.99.023623Project
Gobierno de España. MAT2014-53119-C2-1-R; Gobierno de España. MAT2017-83772-REditor's Version
https://doi.org/10.1103/PhysRevA.99.023623Subjects
Atom; Bosons; Trimers; FísicaRights
© 2019 American Physical SocietyAbstract
We study the early-time dynamics of a degenerate Bose gas after a sudden quench of the interaction strength, starting from a weakly interacting gas. By making use of a time-dependent generalization of the Nozières-Saint-James variational formalism, we describe the crossover of the early-time dynamics from shallow to deep interaction quenches. We analyze the coherent oscillations that characterize both the density of excited states and the Tan's contact as a function of the final scattering length. For shallow quenches, the oscillatory behavior is negligible and the dynamics is universally governed by the healing length and the mean-field interaction energy. By increasing the final scattering length to intermediate values, we reveal a universal regime where the period of the coherent atom-molecule oscillations is set by the molecule binding energy. For the largest scattering lengths we can numerically simulate in the unitary regime, we find a universal scaling behavior of the typical growth time of the momentum distribution in agreement with recent experimental observations [C. Eigen et al., Nature 563, 221 (2018)10.1038/s41586-018-0674-1]
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Google Scholar:Muñoz De Las Heras, A.
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Parish, M. M.
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Marchetti, Francesca María
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