临界费米面的一个大 $N$ 理论 II:电导率
强关联电子
2023-07-20 v8 高能物理 - 理论
摘要
费米面与标量场的耦合可在 展开中描述,方法是选取费米子-标量 Yukawa 耦合在 维味空间中是随机的,但在平移下不变。我们计算了此类理论在二维空间中针对临界标量的电导率。我们发现一个 Drude 贡献,并验证了对频率 光学电导率的 贡献在凸费米面下具有消失的系数。我们还描述了费米子杂质散射的影响,发现虽然自能类似于边际费米液体,但电阻率与光学电导率表现得像费米液体。
引用
@article{arxiv.2207.08841,
title = {Large $N$ theory of critical Fermi surfaces II: conductivity},
author = {Haoyu Guo and Aavishkar A. Patel and Ilya Esterlis and Subir Sachdev},
journal= {arXiv preprint arXiv:2207.08841},
year = {2023}
}
备注
50 pages, 1 figure. This analysis appeared originally in the supplement of arXiv:2203.04990, and has now been extracted into this paper. Part I is arXiv:2103.08615. (v4) Added references. (v5) Added appendix showing cancellation of diagrams. Added reference to arXiv:2208.04328. (v8) Fixed typo