论文标题
横向对称的Weyl半含量中的线性极化光诱导的横向手性磁光电流
Transverse Chiral Magnetic Photocurrent Induced by Linearly Polarized Light in Mirror-Symmetric Weyl Semimetals
论文作者
论文摘要
预计在I型和II类型Weyl半含量中，预计将出现新的光电。与先前研究的手性材料中的光电不同，所提出的电流既不需要圆形的偏振光，也不需要相对于反射平面而没有对称性。我们表明，如果Weyl半学的反转对称性断裂，那么线性极化的光仍可以诱导光电流横向向施加的磁场的方向，尽管相对于反射平面和时间反向对称性有对称性。我们期望发生这种情况的材料类别足够宽，包括过渡金属单媒体（如TAA）。该作用源于磁场中的Weyl手性准粒子的动力学，受上述对称性的限制。因为所得的电流横向到磁场的方向，所以我们称其为横向手性磁光电流。预计所得的光电流的大小在THZ频率范围内将是显着的，约为$ 0.75 \; \ Mathrm {μa} $用于类型I和$ 2.5 \; \ Mathrm {μA} $用于II类型Weyl半法。这打开了利用预测的横向手性磁光电流来感测未偏振THZ辐射的可能性。
A new class of photocurrents is predicted to occur in both type-I and type-II Weyl semimetals. Unlike the previously studied photocurrents in chiral materials, the proposed current requires neither circularly polarized light, nor an absence of symmetry with respect to a plane of reflection. We show that if a Weyl semimetal has a broken inversion symmetry then linearly polarized light can induce a photocurrent transverse to the direction of an applied magnetic field, in spite of the symmetry with respect to a reflection plane and the time reversal symmetry. The class of materials in which we expect this to occur is sufficiently broad and includes the transition metal monopnictides such as TaAs. The effect stems from the dynamics of Weyl chiral quasi-particles in a magnetic field, restricted by the symmetries described above; because the resulting current is transverse to the direction of magnetic field, we call it the transverse chiral magnetic photocurrent. The magnitude of the resulting photocurrent is predicted to be significant in the THz frequency range, about $0.75\; \mathrm{μA}$ for type-I and $2.5\; \mathrm{μA}$ for type-II Weyl semimetals. This opens the possibility to utilize the predicted transverse chiral magnetic photocurrent for sensing unpolarized THz radiation.
