标题： 从外尔到扭结半金属的相变使用双圆偏振激光 显示英文标题

标题： Phase transition from Weyl to knotted semimetal using bi-circular laser

摘要： 本研究展示了由双圆偏振光驱动的三重非厄米（NH）外尔半金属（WSM）的费米面拓扑结构。特别地，一个NH WSM具有显著的特征。然而，双圆光会改变非厄米三重外尔的对称性特征，并导致一种不寻常的新类型能带交换。我们观察到虚能带（有或没有例外简并）之间的交换，这导致了双环和纽结形式的独特费米面。这是在之前从未讨论过的外尔相和纽结相之间的相变。我们还讨论了贝里曲率相应的变化。 显示英文摘要

摘要： The Fermi surface topology of a triple non-hermitian (NH) Weyl semimetal (WSM) driven by bi-circularly polarized light is presented in this study. A NH WSM in particular has remarkable outlines. Bi-circular light, however, modifies the symmetry features of non-hermitian triple Weyl and causes an unusual new kind of band swapping. We observe swapping between the imaginary bands (with or without exceptional degenaracies), which causes unique Fermi surfaces in the form of double rings and knots. This is something never discussed before phase transition between Weyl and knotted phases. We also discuss the corresponding changes in the Berry curvature as well.