Spin Dynamics of a Trapped Spin-1 Bose Gas above the Bose-Einstein Transition Temperature
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We study collective spin oscillations in a trapped spin-1 Bose gas above the Bose-Einstein transition temperature. Starting from the Heisenberg equation of motion, we derive a kinetic equation describing the dynamics of a thermal gas with the spin-1 internal degree of freedom. Applying the moment method to the kinetic equation, we study spin-wave collective modes with dipole symmetry. The dipole modes in the spin-1 system are classified into the three types of modes. These frequencies and damping rates are obtained as functions of the peak density. Moreover we find that the damping rate is characterized by three relaxation times associated with collisions.
KeywordsBose-Einstein condensate Spinor condensate Finite-temperature
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- 16.L. Pitaevskii, S. Stringari, in Bose-Einstein Condensation (The International Series of Monographs on Physics), (Oxford, Clarendon, 2003), Chap. 12 Google Scholar
- 21.G. Baym, C. Pethick, Landau Fermi-Liquid Theory: Concepts and Applications (Wiley-Interscience, Germany, 1999), Chap. 1 Google Scholar