Quenched Dynamics of the Momentum Distribution of the Unitary Bose Gas

Year: 2015

Authors: Ancilotto F., Rossi M., Salasnich L., Toigo F.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35122 Padua, Italy; Univ Padua, CNISM, I-35122 Padua, Italy; CNR, IOM Democritos, I-34136 Trieste, Italy; CNR, INO, I-50019 Sesto Fiorentino, Italy.

Abstract: We study the quenched dynamics of the momentum distribution of a unitary Bose gas under isotropic harmonic confinement within a time-dependent density functional approach based on our recently calculated Monte Carlo bulk equation of state. In our calculations the inter-atomic s-wave scattering length of the trapped bosons is suddenly increased to a very large value and the real-time evolution of the system is studied. Prompted by the very recent experimental data of Rb-85 atoms at unitarity (Makotyn et al. in Nat Phys 10:116, 2014) we focus on the momentum distribution as a function of time. Our results suggest that at low momenta, a quasi-stationary momentum distribution is reached after a long transient, contrary to what found experimentally for large momenta which equilibrate on a time scale shorter than the one for three body losses.

Journal/Review: FEW-BODY SYSTEMS

Volume: 56 (11-12)      Pages from: 801  to: 807

DOI: 10.1007/s00601-015-0971-2

Citations: 8
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