Properties of a nematic spin vortex in an antiferromagnetic spin-1 Bose-Einstein condensate

Abstract

A spin-1 condensate with antiferromagnetic interactions supports nematic spin vortices in the easy-plane polar phase. These vortices have a $2\pi$ winding of the nematic director, with a core structure that depends on the quadratic Zeeman energy. We characterize the properties of the nematic spin vortex in a uniform quasi-two-dimensional system. We also obtain the vortex excitation spectrum and use it to quantify its stability against dissociating into two half-quantum vortices, finding a parameter regime where the nematic spin vortex is dynamically stable. These results are supported by full dynamical simulations.

10 pages, 6 figures

References in corpus (13)

• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Generation of dark-bright soliton trains in superfluid-superfluid counterflow
• Dynamical Creation of Fractionalized Vortices and Vortex Lattices
• Energy spectra of vortex distributions in two-dimensional quantum turbulence
• Interaction of half-quantized vortices in two-component Bose-Einstein condensates
• Binary Quantum Turbulence Arising from Countersuperflow Instability in Two-Component Bose-Einstein Condensates
• Energetically stable singular vortex cores in an atomic spin-1 Bose-Einstein condensate
• Critical spin superflow in a spinor Bose-Einstein condensate
• Coarsening dynamics driven by vortex-antivortex annihilation in ferromagnetic Bose-Einstein condensates
• Counter-flow instability of a quantum mixture of two superfluids
• Vortex splitting and phase separating instabilities of coreless vortices in F=1 spinor Bose-Einstein condensates
• Dynamics of polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate
• Superfluidity of pure spin current in ultracold Bose gases