Producing superfluid circulation states using phase imprinting

Avinash Kumar, Romain Dubessy, Thomas Badr, Camilla De Rossi, Mathieu de Goër de Herve, Laurent Longchambon, Hélène Perrin
2018 Physical Review A  
We propose a method to prepare states of given quantized circulation in annular Bose-Einstein condensates (BEC) confined in a ring trap using the method of phase imprinting without relying on a two-photon angular momentum transfer. The desired phase profile is imprinted on the atomic wave function using a short light pulse with a tailored intensity pattern generated with a Spatial Light Modulator. We demonstrate the realization of 'helicoidal' intensity profiles suitable for this purpose. Due
more » ... the diffraction limit, the theoretical steplike intensity profile is not achievable in practice. We investigate the effect of imprinting an intensity profile smoothed by a finite optical resolution onto the annular BEC with a numerical simulation of the time-dependent Gross-Pitaevskii equation. This allows us to optimize the intensity pattern for a given target circulation to compensate for the limited resolution.
doi:10.1103/physreva.97.043615 fatcat:35n4jbfbzzfibpqhtonzzsnv5m