Expansion dynamics of a spherical Bose-Einstein condensate
arXiv:1811.02719 · doi:10.1088/1674-1056/ab4177
Abstract
We experimentally and theoretically observe the expansion behaviors of a spherical Bose-Einstein condensate. A rubidium condensate is produced in an isotropic optical dipole trap with an asphericity of 0.037. We measure the variation of the condensate size during the expansion process. The free expansion of the condensate is isotropic, which is different from that of the condensate usually produced in the anisotropic trap. The expansion in the short time is speeding and then after a long time the expansion velocity asymptotically approaches a constant value. We derive an analytic solution of the expansion behavior based on the spherical symmetry, allowing a quantitative comparison with the experimental measurement. The interaction energy of the condensate is gradually converted into the kinetic energy at the beginning of the expansion and the kinetic energy dominates after a long-time expansion. We obtain the interaction energy of the condensate in the trap by probing the expansion velocity, which is consistent with the theoretical prediction.
arXiv comment6 pages, 5 figures
References in corpus (25)
- Many-Body Physics with Ultracold Gases
- Theory of Bose-Einstein condensation in trapped gases
- Quantum Simulation
- A spin-orbit coupled Bose-Einstein condensate
- Artificial gauge potentials for neutral atoms
- Atomic quantum gases in periodically driven optical lattices
- One dimensional Bosons: From Condensed Matter Systems to Ultracold Gases
- Collective excitations of a trapped Bose-condensed gas
- Ground-State Properties of Magnetically Trapped Bose-Condensed Rubidium Gas
- Bosons in anisotropic traps: ground state and vortices
- Rapid production of Rb BECs in a combined magnetic and optical potential
- Collisionless dynamics of dilute Bose gases: Role of quantum and thermal fluctuations
- Spin-orbital-angular-momentum coupled Bose-Einstein condensates
- Observation of quantum phase transition in spin-orbital-angular-momentum coupled Bose-Einstein condensate
- Modelling Bose-condensed gases at finite temperatures with -body simulations
- Nonlinear Dynamics of a Bose Condensed Gas
- Temperature-induced resonances and Landau damping of collective modes in Bose-Einstein condensed gases in spherical traps
- Persistence of a Non-Equilibrium State: Observation of a Boltzmannian Special Case
- Rotating atomic quantum gases with light-induced azimuthal gauge potentials and the observation of Hess-Fairbank effect
- Phenomenological Theory of Mode Collapse-revival in Confined Bose Gas
- Collective oscillations of a confined Bose gas at finite temperature in the random-phase approximation
- Damped Bogoliubov excitations of a condensate interacting with a static thermal cloud
- Collapse and revival of the monopole mode of a degenerate Bose gas in an isotropic harmonic trap
- Bose-Einstein condensation in a stiff TOP trap with adjustable geometry
- Optimizing the optical imaging system by \emph{in-situ} imaging the plugged hole in the ultracold atoms