Robust hyperbolic plasmons in a graphene allotrope with dual anisotropic Dirac cones

Wang, Mingzheng; Fan, Runyu; Ma, Xikui; Ding, Chao; Sun, Lei; Li, Yangyang; Zhao, Mingwen

doi:10.1103/physrevb.110.085415

Phys. Rev. B

2024

DOI: 10.1103/physrevb.110.085415

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Robust hyperbolic plasmons in a graphene allotrope with dual anisotropic Dirac cones

Mingzheng Wang,

Runyu Fan,

Xikui Ma

et al.

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Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions

Gao,

Zhang,

Ding

et al. 2024

Opt. Express

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Plasmons in two-dimensional (2D) materials have attracted considerable interest due to their ability to confine light at subwavelength scales. Anisotropic 2D materials, in particular, offer unique opportunities for directional control over plasmon propagation and light-matter interactions. In this study, employing first-principles calculations, we demonstrate that monolayer Ca4N2 can host tunable anisotropic plasmon modes. The electronic band structure of Ca4N2 exhibits pronounced anisotropy, characterized by a pair of saddle-like points. The spatial symmetries of the Bloch wave functions enable orbital-selective interband transitions between these points, which are allowed along the y-direction but forbidden along the x-direction. The anisotropy of plasmons can be enhanced (or diminished) by improving (or reducing) the electron chemical potential, leading to the topological transition of surface plasmon polaritons among elliptical, hyperbolic and isotropic wavefronts. These findings deepen our understanding of anisotropic plasmon behaviors in 2D materials and provide a potential pathway for designing highly tunable plasmonic devices.

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Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions

Gao,

Zhang,

Ding

et al. 2024

Opt. Express

View full text Add to dashboard Cite

show abstract

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Robust hyperbolic plasmons in a graphene allotrope with dual anisotropic Dirac cones

Cited by 1 publication

References 54 publications

Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions

Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions

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Robust hyperbolic plasmons in a graphene allotrope with dual anisotropic Dirac cones

Cited by 1 publication

References 54 publications

Tunable anisotropic plasmons in monolayer Ca4N2 induced by orbital-selective transitions

Tunable anisotropic plasmons in monolayer Ca4N2 induced by orbital-selective transitions

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Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions

Tunable anisotropic plasmons in monolayer Ca₄N₂ induced by orbital-selective transitions