Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas.
View / Open Files
Publication Date
2017-12-22Journal Title
Physical review letters
ISSN
0031-9007
Publisher
APS
Volume
119
Issue
25
Pages
250404
Language
eng
Type
Article
This Version
AM
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Eigen, C., Glidden, J., Lopes, R., Navon, N., Hadzibabic, Z., & Smith, R. (2017). Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas.. Physical review letters, 119 (25), 250404. https://doi.org/10.1103/physrevlett.119.250404
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 behaviour, both of which are characterised 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 $\propto N^{2/3}$
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.
Sponsorship
Royal Society (uf110236)
European Office of Aerospace Research and Development (EOARD) (W911NF-15-1-0444)
EPSRC (EP/N011759/1)
ECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (682285)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (704832)
EPSRC (via University of Strathclyde) (EP/P009565/1)
Identifiers
External DOI: https://doi.org/10.1103/physrevlett.119.250404
This record's URL: https://www.repository.cam.ac.uk/handle/1810/270726
Rights
Licence:
http://www.rioxx.net/licenses/all-rights-reserved