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Latin America Optics and Photonics Conference

Mechanism of vortices generation for a trapped superfluid under oscillatory excitation

P. E. S. Tavares, Gustavo Deczka Telles, R. F. Shiozaki, C. Castelo Branco, Kílvia Mayre Farias, Vanderlei Salvador Bagnato

Published Jan 1, 2012• 0 citations
Publisher

Abstract

We observed a relative motion in between a 87Rb Bose-Einstein condensate and the thermal fraction, excited by a time-varying magnetic field. This motion produce ripples on the BEC/thermal interface and gives evidences of vortex nucleation mechanism.
DOI
10.1364/laop.2012.lm2a.18

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We report on the observation of vortex formation in a Bose-Einstein condensate of 87Rb^{87}\text{R}\text{b}87Rb atoms. Vortices are generated by superimposing an oscillating excitation to the trapping potential introduced by an external magnetic field. For small amplitudes of the external excitation field we observe a bending of the cloud axis. Increasing the amplitude we observe formation of a growing number of vortices in the sample. Shot-to-shot variations in both vortex number and position within the condensed cloud are observed, probably due to the intrinsic vortex nucleation dynamics. We discuss the possible formation of vortices and antivortices in the sample as well as possible mechanisms for vortex nucleation.
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