Elliptic flow in a strongly-interacting normal Bose gas
arXiv:1803.06338 · doi:10.1103/PhysRevA.98.011601
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.
arXiv comment4 pages, 3 figures
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- Emergent interaction-driven elliptic flow of few fermionic atoms
- Observing the loss and revival of long-range phase coherence through disorder quenches
- Magnetic-field-induced tunability of spin Hamiltonians: Resonances and Efimov states in YbTiO
- Observation of Universal Expansion Anisotropy from Cold Atoms to Hot Quark-Gluon Plasma