Coupling Between Spin and Orbital-Angular-Momentum in a Bose Condensate
Yu-Ju Lin1*
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan
* Presenter:Yu-Ju Lin,
We demonstrate coupling between the atomic spin and orbital-angular-momentum (OAM) of the atom's center-of-mass motion by Raman-dressing lasers with a Laguerre-Gaussian beam. This is evidenced by the creations of coreless spin vortices in a F = 1 87Rb spinor Bose-Einstein condensate in the non-magnetized polar state. With this excited-band polar dressed state, we show the spin-OAM locking and characterized the spin texture in agreements with the theory. We study the excited dressed state's stability in the presence of the Raman fields after the loading; it persists for ~0.1 s near resonance and decays to the lowest-energy dressed band due to the collision-induced relaxation.

Keywords: ultracold atoms, Bose condensates, synthetic gauge potentials