Persistent currents in spinor condensates.

  title={Persistent currents in spinor condensates.},
  author={Scott Beattie and Stuart Moulder and Richard J. Fletcher and Zoran Hadzibabic},
  journal={Physical review letters},
  volume={110 2},
We create and study persistent currents in a toroidal two-component Bose gas, consisting of 87Rb 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 polarization 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-polarization vector, rather than… 

Figures from this paper

Critical Spin Superflow in a Spinor Bose-Einstein Condensate.
Another critical point for spin superflow is identified, in which transverse magnon excitations are dynamically generated via spin-exchanging collisions, which leads to the transient formation of axial polar spin domains.
Persistent currents in a two-component Bose–Einstein condensate confined in a ring potential
We present variational and numerical solutions for the problem of stability of persistent currents in a two-component Bose–Einstein condensate of distinguishable atoms which rotate in a ring
Josephson-like Oscillations in Toroidal Spinor Bose-Einstein Condensates: A Prospective Symmetry Probe
Josephson junctions are essential ingredients in the superconducting circuits used in many existing quantum technologies. Additionally, ultracold atomic quantum gases have also become essential
Persistent Currents in Rings of Ultracold Fermionic Atoms.
We have produced persistent currents of ultracold fermionic atoms trapped in a ring, with lifetimes greater than 10 sec in the strongly interacting regime. These currents remain stable well into the
Spin-orbit-coupled spin-1 Bose-Einstein condensates in a toroidal trap: Even-petal-number necklacelike state and persistent flow
Spin-orbit coupling has novel spin-flip symmetries, a spin-1 spinor Bose-Einstein condensate owns meaningful interactions, and a toroidal trap is topologically nontrivial. We incorporate the three
Persistent current oscillations in a double-ring quantum gas
Vorticity in closed quantum fluid circuits is known to arise in the form of persistent currents. In this work, we develop a method to engineer transport of the quantized vorticity between
Observation of Spin Superfluidity in a Bose Gas Mixture.
The spin dynamics of a harmonically trapped Bose-Einstein condensed binary mixture of sodium atoms is experimentally investigated at finite temperature. In the collisional regime the motion of the
A study of coherently coupled two-component Bose-Einstein condensates
We present a self-consistent study of coherently coupled two-component Bose-Einstein condensates. Finite spin-flipping coupling changes the first order demixing phase transition for Bose-Bose