Spinor dynamics in an antiferromagnetic spin-1 thermal bose gas

Hyewon Pechkis, Jonathan Wrubel, Arne Schwettmann, Paul Griffin, Ryan Barnett, Eite Tiesinga, Paul Lett

Research output: Contribution to journalLetterpeer-review

32 Citations (Scopus)


We present experimental observations of coherent spin-population oscillations in a cold thermal, Bose gas of spin-1 23Na atoms. The population oscillations in a multi-spatial-mode thermal gas have the same behavior as those observed in a single-spatial-mode antiferromagnetic spinor Bose-Einstein condensate. We demonstrate this by showing that the two situations are described by the same dynamical equations, with a factor of 2 change in the spin-dependent interaction coefficient, which results from the change to particles with distinguishable momentum states in the thermal gas. We compare this theory to the measured spin population evolution after times up to a few hundreds of ms, finding quantitative agreement with the amplitude and period. We also measure the damping time of the oscillations as a function of magnetic field.
Original languageEnglish
Article number025301
Number of pages5
JournalPhysical Review Letters
Issue number2
Publication statusPublished - 9 Jul 2013


  • Bose-Einstein condensate
  • Spinor BEC
  • cold thermal


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