Fig. 4: Stripe nature of vortices in a dipolar BEC.
From: Observation of vortices and vortex stripes in a dipolar condensate
a, Left: ground-state stripe lattice solution for our experimental parameters as = 109a0, trap frequencies (ω⊥, ωz) = 2π × [50, 130] Hz, N = 10,000 and Ω = 0.75ω⊥. Middle: corresponding residual image, found by subtracting the ground state from the blurred image, with circles showing the detected vortices. Right: Fourier transform of the residual image. b, Left: single experimental image after 500 ms of continuous rotation at Ω = 0.75ω⊥. Middle: the corresponding residual image. Right: Fourier transform of the residual images, averaged over 49 runs, with example shots shown to the right. c, Left: simulation result for the dynamic experimental procedure in b. Middle and right: residuals (middle) and FT analysis (right) (115 temporal images) as in b. d, The same as b for 121 runs, but we rotate for an additional 100 ms and then spiral the magnetic field to θ = 0° over a further 100 ms before imaging. e, Simulation result for procedure in d. All simulation images are rotated to have the same magnetic-field direction as the experiment, as indicated by the white arrow in a and by the circles in d.
