Dirac和Weyl材料中作为谷和手征分裂器的赝磁透镜
Pseudomagnetic lens as a valley and chirality splitter in Dirac and Weyl materials
摘要：
提出了狄拉克和外尔材料中的应变感生赝磁场可以作为外尔准粒子束的谷值和手征敏感透镜。本文用程函近似描述了Weyl准粒子在磁场和应变诱导赝磁场中的传播，研究了赝磁透镜。在近轴近似下，得到了透镜内部有效磁场均匀和非均匀模型中主焦点位置和焦距的解析表达式。结果表明，在外加磁场和赝磁场的情况下，左右手准粒子可以聚焦在不同的空间位置。这表明，使用磁透镜和赝磁透镜可以开辟新的方法来产生和操纵手征外尔准粒子束。
英文摘要：
It is proposed that strain-induced pseudomagnetic fields in Dirac and Weyl materials could be used as valley and chirality sensitive lenses for beams of Weyl quasiparticles. The study of the (pseudo-)magnetic lenses is performed by using the eikonal approximation for describing the Weyl quasiparticles propagation in magnetic and strain-induced pseudomagnetic fields. Analytical expressions for the locations of the principal foci and the focal lengths are obtained in the paraxial approximation in the models with uniform as well as nonuniform effective magnetic fields inside the lens. The results show that the left- and right-handed quasiparticles can be focused at different spatial locations when both magnetic and pseudomagnetic fields are applied. It is suggested that the use of magnetic and pseudomagnetic lenses could open new ways of producing and manipulating beams of chiral Weyl quasiparticles.
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