Floquet engineering provides a powerful and flexible method for modifying the band structures of quantum materials.While circularly polarized light has been shown to convert curved nodal lines in three-dimensional sem...Floquet engineering provides a powerful and flexible method for modifying the band structures of quantum materials.While circularly polarized light has been shown to convert curved nodal lines in three-dimensional semimetals into Weyl points,such a transformation is forbidden for an isolated straight nodal line.In this work,we uncover a dramatic shift in this paradigm when multiple straight nodal lines intersect.We observe that circularly polarized light not only gaps them into Weyl points but also induces unprecedented surface-state Fermi arcs that extend across the entire surface Brillouin zone and form a linked topological structure.These findings advance our fundamental understanding of light-driven transitions in topological semimetals and unveil a unique Weyl semimetal phase defined by linked Fermi arcs.We discuss potential exotic phenomena arising from this phase,applications of our predictions to spin-split antiferromagnets,and the extension of this Weyl semimetal phase to classical systems.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.12174455)Guangdong Basic and Applied Basic Research Foundation (Grant No.2023B1515040023)。
文摘Floquet engineering provides a powerful and flexible method for modifying the band structures of quantum materials.While circularly polarized light has been shown to convert curved nodal lines in three-dimensional semimetals into Weyl points,such a transformation is forbidden for an isolated straight nodal line.In this work,we uncover a dramatic shift in this paradigm when multiple straight nodal lines intersect.We observe that circularly polarized light not only gaps them into Weyl points but also induces unprecedented surface-state Fermi arcs that extend across the entire surface Brillouin zone and form a linked topological structure.These findings advance our fundamental understanding of light-driven transitions in topological semimetals and unveil a unique Weyl semimetal phase defined by linked Fermi arcs.We discuss potential exotic phenomena arising from this phase,applications of our predictions to spin-split antiferromagnets,and the extension of this Weyl semimetal phase to classical systems.
