Quantum phases and spectrum of collective modes in a spin-1 BEC with spin-orbital-angular-momentum coupling

Abstract

Motivated by the recent experiments [Chen et al., Phys. Rev. Lett 121, 113204 (2018), Chen et al., Phys. Rev. Lett. 121, 250401 (2018)], we investigate the low-lying excitation spectrum of the ground-state phases of spin-orbital-angular-momentum-coupled (SOAM-coupled) spin-1 condensates.At vanishing detuning, a ferromagnetic SOAM-coupled spin-1 BEC can have two ground-state phases, namely coreless and polar-core vortex states, whereas an antiferromagnetic BEC supports only polar-core vortex solution. The angular momentum per particle, longitudinal magnetization, and excitation frequencies display discontinuities across the phase boundary between the coreless vortex and polar-core vortex phases. The low-lying excitation spectrum evaluated by solving the Bogoliubov-de-Gennes equations is marked by avoided crossings and hence the hybridization of the spin and density channels. The spectrum is further confirmed by the dynamical evolution of the ground state subjected to a perturbation suitable to excite a density or a spin mode and a variational analysis for the density-breathing mode.

References in corpus (10)

• Spin-Orbit Coupled Spinor Bose-Einstein Condensates
• Tuning the scattering length with an optically induced Feshbach resonance
• Softening of Roton and Phonon Modes in a Bose-Einstein Condensate with Spin-Orbit Coupling
• Measurement of collective excitations in a spin-orbit-coupled Bose-Einstein condensate
• Spin - orbital-angular-momentum coupling in Bose-Einstein condensates
• Angular spin-orbit coupling in cold atoms
• Quantum phases of Bose-Einstein condensates with synthetic spin - orbital-angular-momentum coupling
• Stationary States of Trapped Spin-Orbit-Coupled Bose-Einstein Condensates
• Spin-orbital-angular-momentum-coupled quantum gases
• Fine structure of the stripe phase in ring-shaped Bose-Einstein condensates with spin-orbital-angular-momentum coupling

Cited by in corpus (7)

• Excitations of a supersolid annular stripe phase in a spin-orbital-angular-momentum-coupled spin-1 Bose-Einstein condensate
• Temperature-induced supersolidity in spin-orbit-coupled Bose gases
• Synthetic spin-orbit coupling for the multispin models in optical lattices
• Fast transport and splitting of spin-orbit-coupled spin-1 Bose-Einstein Condensates
• Excitation spectrum of vortex-lattice modes in a rotating condensate with a density-dependent gauge potential
• The synthetic gauge field and exotic vortex phase with spin-orbital-angular-momentum coupling
• Finite-temperature phase diagram and collective modes of coherently coupled Bose mixtures