Fig. 2: Observation of vortices in a dipolar BEC.
From: Observation of vortices and vortex stripes in a dipolar condensate
Each column shows the simulated (top) and experimental (bottom) images for various rotation times tΩ. For the experiment, the atoms are imaged along the z direction. In each experimental run, we rotate the magnetic field anticlockwise at Ω = 0.74ω⊥ for different rotation times tΩ. The magnetic-field value is kept to B = 5.333(5) G. The initial condensed atom number is N = 15,000. The decreasing size of the cloud suggests a decrease in atom number. However, for states with vortices or spiral shapes, appearing at large tΩ, our bimodal fit to extract the atom number breaks down. For the corresponding simulations, the parameters are as = 112a0, trap frequencies (ω⊥, ωz) = 2π × [50, 150] Hz, N = 8,000 and Ω = 0.75ω⊥.
