2017/08/31 by Christoph Eigen, Jake Glidden, Jake A. P. Glidden +4 · 1 citation
Physics and Astronomy · #Atomic and Subatomic Physics Research #Bose gas #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Crossover #Degenerate energy levels #Electron #Fermi gas #Feshbach resonance #Kinetic energy #Molecule #Physics #Quantum mechanics #Quantum, superfluid, helium dynamics #Resonance (particle physics) #Scaling #cond-mat.quant-gas #physics.atom-ph #quant-ph
paper · pdf · doi:10.1103/physrevlett.119.250404
published as Phys. Rev. Lett. 119, 250404 (2017) · 5 pages, 5 figures
arxiv created 2017/08/31 · openalex publication_date 2017/12/22 · arxiv updated 2017/12/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 ∝N2/3 and N26/9, 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.