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Elliptic flow in a strongly interacting normal Bose gas


Type

Article

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Authors

Fletcher, RJ 
Man, J 
Lopes, R 
Christodoulou, Panagiotis  ORCID logo  https://orcid.org/0000-0001-7800-9484
Schmitt, J 

Abstract

We study the anisotropic, elliptic expansion of a thermal atomic Bose gas released from an anisotropic trapping potential, for a wide range of interaction strengths across a Feshbach resonance. We show that in our system this hydrodynamic phenomenon is for all interaction strengths fully described by a microscopic kinetic model with no free parameters. The success of this description crucially relies on taking into account the reduced thermalising power of elastic collisions in a strongly interacting gas, for which we derive an analytical theory. We also perform time-resolved measurements that directly reveal the dynamics of the energy transfer between the different expansion axes.

Description

Keywords

cond-mat.quant-gas, cond-mat.quant-gas, cond-mat.stat-mech, physics.atom-ph, physics.plasm-ph, quant-ph

Journal Title

Physical Review A

Conference Name

Journal ISSN

2469-9926
2469-9934

Volume Title

98

Publisher

American Physical Society (APS)
Sponsorship
European Office of Aerospace Research and Development (EOARD) (W911NF-15-1-0444)
Engineering and Physical Sciences Research Council (EP/N011759/1)
European Research Council (682285)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (704832)
Engineering and Physical Sciences Research Council (EP/P009565/1)