Spin - orbital-angular-momentum coupling in Bose-Einstein condensates

Abstract

Spin-orbit coupling (SOC) plays a crucial role in many branches of physics. In this context, the recent experimental realization of the coupling between spin and linear momentum of ultracold atoms opens a completely new avenue for exploring new spin-related superfluid physics. Here we propose that another important and fundamental SOC, the coupling between spin and orbital angular momentum (SOAM), can be implemented for ultracold atoms using higher-order Laguerre-Gaussian laser beams to induce Raman coupling between two hyperfine spin states of atoms. We study the ground-state phase diagrams of SOAM-coupled Bose-Einstein condensates on a ring trap and explore their applications in gravitational force detection. Our results may provide the basis for further investigation of intriguing superfluid physics induced by SOAM coupling, such as collective excitations.

7 pages, 4 figures

References in corpus (15)

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• Magnetic field dependence of Raman coupling in Alkali atoms
• Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap

Cited by in corpus (3)

• Spin-orbit-coupled Bose-Einstein condensates held under toroidal trap
• Topological spinor vortex matter on spherical surface induced by non-Abelian spin-orbital-angular-momentum coupling
• Phase tunable Josephson junction and spontaneous mass current in a spin-orbit coupled Fermi superfluid