Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas.


Type
Article
Change log
Authors
Glidden, Jake AP 
Lopes, Raphael 
Navon, Nir 
Abstract

We study the dynamics of an initially degenerate homogeneous Bose gas after an interaction quench to the unitary regime at a magnetic Feshbach resonance. As the cloud decays and heats, it exhibits a crossover from degenerate- to thermal-gas behavior, both of which are characterized by universal scaling laws linking the particle-loss rate to the total atom number N. In the degenerate and thermal regimes, the per-particle loss rate is ∝N^{2/3} and N^{26/9}, respectively. The crossover occurs at a universal kinetic energy per particle and at a universal time after the quench, in units of energy and time set by the gas density. By slowly sweeping the magnetic field away from the resonance and creating a mixture of atoms and molecules, we also map out the dynamics of correlations in the unitary gas, which display a universal temporal scaling with the gas density, and reach a steady state while the gas is still degenerate.

Description
Keywords
cond-mat.quant-gas, cond-mat.quant-gas, physics.atom-ph, quant-ph
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
0031-9007
1079-7114
Volume Title
119
Publisher
American Physical Society (APS)
Sponsorship
The Royal Society (uf110236)
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)