涡旋流体中有质量费米子的极化
核理论
2016-08-24 v2
摘要
由于自旋-涡度耦合,费米子在涡旋流体中发生极化。这种极化可通过量子动力学方法中的Wigner函数计算。推广先前关于手征费米子的结果,我们推导了有质量费米子的Wigner函数,直至空间梯度展开的次领头阶。费米子的极化密度可由Wigner函数的轴矢分量计算,并发现与局域涡度成正比。费米子与反费米子每粒子的极化随化学势增大而减小,随能量(质量)增大而增大。两者在大能量(质量)极限下均趋近于渐近值。费米子每粒子的极化始终小于反费米子,其费米子与反费米子之比也随化学势增大而减小。在Cooper-Frye冻结超曲面上的每粒子极化也可被表述,并与Becattini等人的先前结果一致。
引用
@article{arxiv.1604.04036,
title = {Polarization of massive fermions in a vortical fluid},
author = {Ren-hong Fang and Long-gang Pang and Qun Wang and Xin-nian Wang},
journal= {arXiv preprint arXiv:1604.04036},
year = {2016}
}
备注
RevTex 4, 12 pages, 5 figures. Discussions about the correspondence between polarization from vorticity and from magnetic field are added. The property that polarization per particle for fermions is smaller than that for anti-fermions is discussed in more detail. To appear in PRC