论文标题
探测镜像异常和圆形二分的狄拉克半法
Probing mirror anomaly and classes of Dirac semimetals with circular dichroism
论文作者
论文摘要
从理论上讲，我们使用圆形二色性（CD）研究了三维狄拉克半法（DSM）的光活性。我们表明，在材料的任何镜面对称平面中存在磁场的情况下，DSM均表现出显着的二分色行为。特别是，对于相对于镜像平面的光场的不同方向，II型DSMS中的CD可以通过在镜子对称角度显示出明显不同的模式来检测镜像异常的存在。有趣的是，CD还可以区分ITY-II DSMS在时间反转动量下仅具有一个DIRAC点的I型DSM与晶体旋转轴上有一对Dirac点的Type-I DSMS。
We theoretically investigate the optical activity of three dimensional Dirac semimetals (DSMs) using circular dichroism (CD). We show that DSMs in the presence of a magnetic field in any one of the mirror-symmetric planes of the materials exhibit a notable dichroic behavior. In particular, for different orientations of the light field with respect to the mirror-symmetric plane, the CD in type-II DSMs can detect the presence of mirror anomaly by showing sharply distinct patterns at the mirror-symmetric angle. Interestingly, CD can also distinguish type-II DSMs having only one Dirac point at a time-reversal invariant momentum from type-I DSMs with a pair of Dirac points on the rotation axis of the crystals.
