Berry相中Dirac单极子的透镜效应
高能物理 - 理论
2021-05-12 v3 强关联电子
核理论
摘要
Berry相与具有有限周期的缓慢循环运动相关联,在远离时看起来像一个Dirac单极子,但在参数空间中能级交叉点附近会平滑地变为偶极子,这一性质在一个精确可解模型中得以体现。这种Berry相的拓扑变化被可视化为透镜效应的结果;当模型的变量偏离精确绝热运动时,本应位于能级交叉点的单极子出现在位移点处。由Berry相产生的有效磁场由来自位移Dirac单极子的磁通量的简单几何考量所决定。
引用
@article{arxiv.2101.10541,
title = {Lensing of Dirac monopole in Berry's phase},
author = {Kazuo Fujikawa and Koichiro Umetsu},
journal= {arXiv preprint arXiv:2101.10541},
year = {2021}
}
备注
14 pages, 4 figures. The agreement of Berry's phase with the solid angle drawn by a spin vector in the case of a two-component spinor is explained in connection with the lensing effect. This version is going to appear in Phys. Rev. D