Magnetic states and Kondo screening in Weyl semimetals with chiral anomaly
Magnetic states and Kondo screening in Weyl semimetals with chiral anomaly
复制标题
具有手性异常的 Weyl 半金属的磁态和近藤筛选
DOI：
10.1103/physrevb.98.075110
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
Chen Wei Qiang
中科院分区：
文献类型：
--
作者：
Li Lin;Sun Jin Hua;Wang Zhen Hua;Xu Dong Hui;Luo Hong Gang;Chen Wei Qiang
从理论上研究了外尔半金属中磁性杂质的局域磁态和近藤屏蔽。外尔节点附近的线性色散和杂质能级的异常加宽导致在很宽的参数范围内出现非零磁矩。磁化率显着增强，通过增加手性不平衡的化学势固定在外尔节点。当化学势远离节点时，近藤效应就会发生。低温磁化率由近藤屏蔽和磁性杂质能级的展宽共同决定。当存在手性反常时，近藤屏蔽对位于外尔节点下方和上方的化学势表现出相反的行为。磁化率可以通过节点的电荷不平衡来调节，这为研究外尔型超导体中的手征异常提供了一种方案。
We theoretically study the localized magnetic states and the Kondo screening of a magnetic impurity in the bulk of Weyl semimetals (SMs). The linear dispersion near the Weyl nodes and the anomalous broadening of the impurity level lead to a nonvanishing magnetic moment in a wide region of parameters. The magnetic susceptibility is significantly enhanced by increasing the chirality imbalance for the chemical potential fixed at the Weyl nodes. The Kondo effect takes place whenever the chemical potential is tuned away from the nodes. The low-temperature susceptibility is determined by both the Kondo screening and the broadening of the magnetic impurity level. In the presence of chiral anomaly, the Kondo screening displays opposite behaviors for the chemical potential situated below and above the Weyl nodes. The magnetic susceptibility can be tuned by the charge imbalance of the nodes, which provides a scheme to study the chiral anomaly in Weyl SMs.