论文标题
魏尔半含量的异常传输特征与点缺陷
Anomalous Transport Signatures in Weyl Semimetals with Point Defects
论文作者
论文摘要
我们介绍了具有点缺陷的Weyl半金属的传输特性的第一个理论研究。专注于一类时反转对称的Weyl晶格模型，我们表明稀释晶格空位会在Nodal Energy和附近引起准定位状态的有限密度，从而对低能谱进行了强大的修改。这会产生新的传输效应，即（i）在没有磁场的情况下，DC导率与电荷载体密度的振荡行为，以及（ii）对频段间阈值以下光子频率的平稳形耗散光学响应， $ e_ {f} \！\ sillesim \！\hbarΩ\！\ sillesim \！2e_ {f} $。我们的结果通过公共点缺陷为Weyl Smimetals中非常规量子传输效应提供了途径。
We present the first theoretical study of transport properties of Weyl semimetals with point defects. Focusing on a class of time-reversal symmetric Weyl lattice models, we show that dilute lattice vacancies induce a finite density of quasi-localized states at and near the nodal energy, causing strong modifications to the low-energy spectrum. This generates novel transport effects, namely (i) an oscillatory behaviour of the dc-conductivity with the charge carrier density in the absence of magnetic fields, and (ii) a plateau-shaped dissipative optical response for photon frequencies below the inter-band threshold, $E_{F}\!\lesssim\!\hbarω\!\lesssim\!2E_{F}$.Our results provide a path to engineer unconventional quantum transport effects in Weyl semimetals by means of common point defects.
