Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas
arXiv:1708.09844 · doi: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 . In the degenerate and thermal regimes the per-particle loss rate is and , 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.
arXiv comment5 pages, 5 figures
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