WTe2中轨道选择光激发对Weyl准粒子的操纵
Manipulating Weyl quasiparticles by orbital-selective photoexcitation in WTe2
摘要：
外尔半金属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无耗散的拓扑器件。报道了在线性偏振光（LPL）作用下，II型Weyl材料WTe 2的轨道选择性光激发，在几个拓扑结构不同的相之间产生显著的跃迁.当施加近红外激光脉冲时，包括外尔带的原子轨道的对称特征导致外尔点附近的非对称电子跃迁，并且进而导致层间剪切运动相对于线性光偏振的各向异性响应。因此，不仅可以实现外尔准粒子对的湮灭，而且可以实现外尔点的分离，补充现有的实验观察。我们的结果为同时操纵Weyl节点的奇异性和相干控制电子和晶格量子动力学提供了一个新的视角。
英文摘要：
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.
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