论文标题
WTE2中的轨道选择性光激发操纵Weyl准粒子
Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2
论文作者
论文摘要
Weyl半学的结构和电子特性的光学控制允许在超快尺度上开发可切换和耗散拓扑设备。在线性极化光（LPL）下，据报道了II型Weyl材料Weyl材料中意外的轨道选择性光激发，从而在几个拓扑赋予的阶段引起了惊人的过渡。包含Weyl带的原子轨道的对称特征导致Weyl点附近的不对称电子跃迁，而当应用近红外激光脉冲时，相对于线性光极化，相对于线性光极化，层间剪切运动的各向异性响应。因此，不仅可以歼灭Weyl准粒子对，而且还可以实现Weyl点的增加，从而补充现有的实验观察结果。我们的结果为操纵Weyl节点的奇异性以及对电子和晶格量子动力学的相干控制提供了新的观点。
Optical control of structural and electronic properties of Weyl semimetals allows development of switchable and dissipationless topological devices at the ultrafast scale. An unexpected orbitial-selective photoexcitation in type-II Weyl material WTe2 is reported under linearly polarized light (LPL), inducing striking transitions among several topologically-distinct phases. The symmetry features of atomic orbitals comprising the Weyl bands result in asymmetric electronic transitions near the Weyl points, and in turn an anisotropic response of interlayer shear motion with respect to linear light polarization, when a near-infrared laser pulse is applied. Consequently, not only annihilation of Weyl quasiparticle pairs, but also increasing separation of Weyl points can be achieved, complementing existing experimental observations. Our results provide a new perspective on manipulating the singularity of Weyl nodes and coherent control of electron and lattice quantum dynamics simultaneously.
