A Photoinduced Floquet Mixed-Weyl Semimetallic Phase in a Carbon Allotrope

Abstract

The interplay between light and matter attracts tremendous interest for exploring novel topological quantum states and their phase transitions. Here we show by first-principles calculations and the Floquet theorem that a carbon allotrope bct-C${}_{16}$, a typical nodal-line semimetal, exhibits exotic photoinduced Floquet mixed-Weyl semimetallic features. Under the irradiation of a linearly polarized light, bct-C${}_{16}$ undergos a topological phase transition from a Driac nodal-line semimetal to a Weyl semimetal with two pairs of tunable Weyl points. With increasing the light intensity, left-handed Weyl points evolve from type-I into type-II while right-handed ones are always preserved to be type-I, giving rise to photo-dressed unconventional Weyl pairs composed of distinct types of Weyl points. Importantly, a special Weyl pair formed by type-I and type-III Weyl points is present at the boundary between type-I and type-II states. The Floquet Fermi arcs connecting the projections of two different types of Weyl points are clearly visible, further revealing their unique topological features. Our work not only realizes promising unconventional Weyl pairs but also paves a reliable avenue for investigating light-induced topological phase transitions.

10 pages, 7 figures

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Cited by in corpus (10)

• Floquet Engineering of Nonequilibrium Valley-Polarized Quantum Anomalous Hall Effect with Tunable Chern Number
• Weyl nodes with higher-order topology in an optically driven nodal-line semimetal
• Floquet Weyl semimetal phases in light-irradiated higher-order topological Dirac semimetals
• Floquet Valley-Polarized Quantum Anomalous Hall State in Nonmagnetic Heterobilayers
• Photoinduced Quantum Anomalous Hall States in the Topological Anderson Insulator
• Controllable Weyl Nodes and Fermi Arcs from Floquet Engineering Triple Fermions
• Five-dimensional Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces
• Photoinduced metallic Volkov-Pankratov states in semi-Dirac material
• Volkov-Pankratov states in a driven semimetal for a generic interface
• Floquet second-order topological insulator in strained graphene