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Title
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Cumulant theory of the unitary Bose gas : prethermal and Efimovian dynamics
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Author
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Abstract
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| We study the quench of a degenerate ultracold Bose gas to the unitary regime, where interactions are as strong as allowed by quantum mechanics. We lay the foundation of a cumulant theory able to simultaneously capture the three-body Efimov effect and ergodic evolution. After an initial period of rapid quantum depletion, a universal prethermal stage is established, characterized by a kinetic temperature and an emergent Bogoliubov dispersion law, while the microscopic degrees of freedom remain far from equilibrium. Integrability is then broken by higher-order interaction terms in the many-body Hamiltonian, leading to a momentum-dependent departure from power law to decaying exponential behavior of the occupation numbers at large momentum. We also find signatures of the Efimov effect in the many-body dynamics and make a precise identification between the observed beating phenomenon and the binding energy of an Efimov trimer. Throughout the paper, our predictions for a uniform gas are quantitatively compared with experimental results for quenched unitary Bose gases in uniform potentials. |
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Language
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English
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Source (journal)
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Physical review A
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Publication
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2020
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DOI
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10.1103/PHYSREVA.102.063314
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Volume/pages
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102
:6
(2020)
, 29 p.
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Article Reference
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063314
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ISI
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000597808100008
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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