Fig. 2: Oscillations of expansion velocity.
From: All-optical matter-wave lens using time-averaged potentials
Expansion velocity (σv) after 30 ms of time of flight in dependence of the holding time. The graph shows the expansion velocity for thermal ensembles with different initial temperatures T0 and the Bose-Einstein condensate (BEC) with an initial expansion temperature of T0 = 41 nK and a condensed fraction of Nc/N0 = 92.5%. The markers show the measurements, the dashed-dotted lines the expansion rate from the initial traps (cf. black dashed-dotted line in Fig. 1). The simulations use the scaling ansatz and are depicted as lines with a shaded 1-sigma error estimation for the used trap parameters. The inset displays the size oscillation of the Bose-Einstein condensate on an enlarged scale for better readability.
