Spin-orbital-angular-momentum coupled Bose-Einstein condensates
Abstract
We demonstrate coupling between the atomic spin and orbital-angular-momentum (OAM) of the atom's center-of-mass motion in a Bose-Einstein condensate (BEC). The coupling is induced by Raman-dressing lasers with a Laguerre-Gaussian beam, and creates coreless vortices in a Rb spinor BEC. We observe correlations between spin and OAM in the dressed state and characterize the spin texture; the result is in good agreement with the theory. In the presence of the Raman field our dressed state is stable for 0.1~s or longer, and it decays due to collision-induced relaxation. As we turn off the Raman beams, the vortex cores in the bare spin and split. These spin-OAM coupled systems with the Raman-dressing approach have great potential for exploring new topological textures and quantum states.
Keywords
Cite
@article{arxiv.1803.07860,
title = {Spin-orbital-angular-momentum coupled Bose-Einstein condensates},
author = {H. -R. Chen and K. -Y. Lin and P. -K. Chen and N. -C. Chiu and J. -B. Wang and C. -A. Chen and P. -P. Huang and S. -K. Yip and Yuki Kawaguchi and Y. -J. Lin},
journal= {arXiv preprint arXiv:1803.07860},
year = {2018}
}