平面掺杂反铁磁体和外磁场的规范理论方法
摘要
本文综述了作者最近提出的用于掺杂量子反铁磁平面系统中自旋-电荷分离物理的相对论性非阿贝尔规范理论方法。重点讨论了恒定外磁场对该模型中超导态激发的影响。描述费米面上特定点（例如高 T_c 铜氧化物中 d 波超导能隙节点）激发的带电 Dirac 费米子（空穴子）发生凝聚，导致在这些节点处打开一个类似 Kosterlitz-Thouless 的能隙 (KT)。在平面超导体表面区域存在垂直于超导平面的强外磁场时，这些 KT 能隙似乎会增强。我们基于解析 Schwinger-Dyson 处理的初步分析似乎表明，对于模型中由于规范粒子-空穴 SU(2) 对称性而需要的偶数个 Dirac 费米子种类，宇称或时间反演对称性破坏不一定发生。基于这些考虑，我们认为，最近关于平面高 T_c 铜氧化物在强外磁场中准粒子热导率平台的实验发现，可能表明存在这种由这些材料中带电 Dirac 费米子激发引起的 KT 能隙，正如上述模型所建议的那样。
引用
@article{arxiv.cond-mat/9710288,
title = {Gauge-theory approach to planar doped antiferromagnets and external magnetic fields},
author = {K. Farakos and N. E. Mavromatos},
journal= {arXiv preprint arXiv:cond-mat/9710288},
year = {2015}
}
备注
26 pages LATEX, 6 figures (incorporated) (In this revised version references on magnetic catalysis were added, and also a note was added with a comparison of the theoretical results presented here with a second experiment (cond-mat/9709061), reporting on unconventional superconducting phases in certain cuprates). Journal ref.:Based on Invited talk by N.E.M. at the `5th Chia Workshop on Common Trends in Particle and Condensed Matter Physics', Conference Center, Grand-Hotel Chia-Laguna, Chia, Italy, 1-11 September 1997