Spin-orbital-angular-momentum coupled Bose-Einstein condensates

H. -R. Chen; K. -Y. Lin; P. -K. Chen; N. -C. Chiu; J. -B. Wang; C. -A. Chen; P. -P. Huang; S. -K. Yip; Yuki Kawaguchi; Y. -J. Lin

doi:10.1103/physrevlett.121.113204

arXiv · 1803.07860

Spin-orbital-angular-momentum coupled Bose-Einstein condensates

H. -R. Chen·K. -Y. Lin·P. -K. Chen·N. -C. Chiu·J. -B. Wang·C. -A. Chen·P. -P. Huang·S. -K. Yip·Yuki Kawaguchi·Y. -J. Lin

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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 $F=1$ $^{87}$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 $|m_F=1\rangle$ and $|-1\rangle$ split. These spin-OAM coupled systems with the Raman-dressing approach have great potential for exploring new topological textures and quantum states.

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H. -R. Chen, K. -Y. Lin, P. -K. Chen, N. -C. Chiu, J. -B. Wang, C. -A. Chen, P. -P. Huang, S. -K. Yip, Yuki Kawaguchi, Y. -J. Lin. 2018-03-21. Spin-orbital-angular-momentum coupled Bose-Einstein condensates. https://doi.org/10.1103/physrevlett.121.113204

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