Engineering rich two-dimensional higher-order topological phases by flux and periodic driving

Abstract

Nodal-line semimetals are commonly believed to exist in $\mathcal{P}\mathcal{T}$ symmetric or mirror-rotation symmetric systems. Here, we find a flux-induced parameter-dimensional second-order nodal-line semimetal (SONLS) in a two-dimensional system without $\mathcal{P}\mathcal{T}$ and mirror-rotation symmetries. It has coexisting hinge Fermi arcs and drumhead surface states. Meanwhile, we discover a flux-induced second-order topological insulator (SOTI). We then propose a Floquet engineering scheme to create exotic parameter-dimensional hybrid-order nodal-line semimetals with abundant nodal-line structures and widely tunable numbers of corner states in a SONLS and SOTI, respectively. Our results break the perception of SONLSs and supply a convenient way to artificially synthesize exotic topological phases by periodic driving.

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Cited by in corpus (1)

• Four-dimensional Floquet topological insulator with an emergent second Chern number