Persistent currents in spinor condensates

Abstract

We create and study persistent currents in a toroidal two-component Bose gas, consisting of ${}^{87}$Rb atoms in two different spin states. For a large spin-population imbalance we observe supercurrents persisting for over two minutes. However we find that the supercurrent is unstable for spin polarisation below a well defined critical value. We also investigate the role of phase coherence between the two spin components and show that only the magnitude of the spin-polarisation vector, rather than its orientation in spin space, is relevant for supercurrent stability.

4 pages, 5 figures

References in corpus (5)

• Quantized Rotation of Atoms From Photons with Orbital Angular Momentum
• Observation of persistent flow of a Bose-Einstein condensate in a toroidal trap
• Experimental demonstration of painting arbitrary and dynamic potentials for Bose-Einstein condensates
• A large magnetic storage ring for Bose-Einstein condensates
• Quantum Spin Dynamics of Mode-Squeezed Luttinger Liquids in Two-Component Atomic Gases

Cited by in corpus (14)

• Quench-induced supercurrents in an annular Bose gas
• Interferometric measurement of the current-phase relationship of a superfluid weak link
• Spin - orbital-angular-momentum coupling in Bose-Einstein condensates
• Quantum phases of Bose-Einstein condensates with synthetic spin - orbital-angular-momentum coupling
• Vortices in a toroidal Bose-Einstein condensate with a rotating weak link
• Stochastic Projected Gross-Pitaevskii equation for spinor and multi-component condensates
• Vortex excitation in a stirred toroidal Bose-Einstein condensate
• Hydrodynamic modes of partially condensed Bose mixtures
• Metastability, excitations, fluctuations, and multiple-swallowtail structures of a superfluid in a Bose-Einstein condensate in the presence of a uniformly moving defect
• Optimal scaling of persistent currents for interacting bosons on a ring
• Hysteresis and metastability of Bose-Einstein condensed clouds of atoms confined in ring potentials
• Rotating a Bose-Einstein condensate by shaking an anharmonic axisymmetric magnetic potential
• Artificial Magnetic Fields in Momentum Space in Spin-Orbit Coupled Systems
• Metastable spin textures and Nambu-Goldstone modes of a ferromagnetic spin-1 Bose-Einstein condensate confined in a ring trap