玻色-爱因斯坦transition temperature上方自旋1玻色气体的自旋动力学
Spin dynamics of a trapped spin-1 Bose Gas above the Bose-Einstein transition temperature
摘要：
研究了玻色-爱因斯坦转变温度以上自旋为1的玻色气体中的集体自旋振荡。从海森伯运动方程出发，导出了描述自旋为1的热气体动力学的动力学方程。将矩量法应用于动力学方程，研究了具有偶极对称性的自旋波集体模。发现自旋为1的系统中的偶极模可分为三类。频率和阻尼率作为峰值密度的函数。阻尼率的特征在于与碰撞相关的三个弛豫时间。
英文摘要：
We study collective spin oscillations in a 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 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 found to be classified into the three type of modes. The frequency and damping rate are obtained as functions of the peak density. The damping rate is characterized by three relaxation times associated with collisions.
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