学术报告第213期：Non-equilibrium spin transport and relaxation time approximation

主讲人 (Speaker): 

王梓岳

主讲人单位 (Speaker's Institute): 

清华大学物理系

邀请人 (Invited by): 

林树

时间 (Time): 

星期二, 2021/05/25 - 10:00 to 11:00

地点 (Location): 

珠海校区天琴中心2316会议室

摘要 (Abstract): 

We analyze the collision terms in spin transport theory for systems close to equilibrium. While the equilibrium spin distribution function can be obtained from the detailed balance principle, the non-equilibrium fluctuations in spin distribution include both damping and polarization effect. The damping and polarization rates or the relaxation times are expressed in terms of various Dirac components of the selfenergy. Unlike the usually used Anderson-Witting relaxation time approximation assuming a single time scale for different degrees of freedom, the polarization effect is induced by the thermal vorticity and its time scale of thermalization is different from the damping. The numerical calculation in the Nambu–Jona-Lasinio model shows that, charge is thermalized earlier and spin is thermalized later.

主讲人简介 (Speaker's CV): 

王梓岳，于2019年在清华大学物理系获得博士学位，现在继续在清华大学从事博士后研究工作。博士期间的研究兴趣包括强相互作用物质的相变，以及泛函重整化群。博士后期间的研究主要关注重离子碰撞中的自旋输运现象。