Kondo链中的量子相变与受保护理想输运
介观与纳米尺度物理
2015-11-25 v2 无序系统与神经网络
强关联电子
摘要
我们研究了一维能带中电子通过各向异性交换相互作用与磁矩相互作用的Kondo链的低能物理。结果表明，各向异性导致了两个不同的相，它们被一个量子相变所分离。在具有易平面各向异性的相中，具有不同电子螺旋性扇区之间的Z对称性被破坏。结果，局域化效应被抑制，且直流输运获得了（部分）对称性保护。该效应类似于时间反演不变拓扑绝缘体中边缘输运的保护。具有易轴各向异性的相对应于具有显著自旋-电荷分离的Tomonaga-Luttinger液体。缓慢的电荷密度波模没有针对局域化的保护。
引用
@article{arxiv.1506.06368,
title = {Quantum Phase Transition and Protected Ideal Transport in a Kondo Chain},
author = {A. M. Tsvelik and O. M. Yevtushenko},
journal= {arXiv preprint arXiv:1506.06368},
year = {2015}
}
备注
revised version of the manuscript (accepted for publication in PRL): the detailed analysis of disorder effects has been added; the spacial scale, beyond which protection of the ideal transport is removed, has been calculated; several references have been added; 10 pages (including Supplemental Materials), 5 figure