Topological insulators are tunable waveguides for hyperbolic polaritons

Abstract

Layered topological insulators, for example, Bi${}_2$Se${}_3$ are optically hyperbolic materials in a range of THz frequencies. Such materials possess deeply subdiffractional, highly directional collective modes: hyperbolic phonon-polaritons. In thin crystals the dispersion of such modes is split into discrete subbands and is strongly influenced by electron surface states. If the surface states are doped, then hybrid collective modes result from coupling of the phonon-polaritons with surface plasmons. The strength of the hybridization can be controlled by an external gate that varies the chemical potential of the surface states. Momentum-dependence of the plasmon-phonon coupling leads to a polaritonic analog of the Goos-Hänchen effect. Directionality of the polaritonic rays and their tunable Goos-Hänchen shift are observable via THz nanoimaging.

12 pages, 7 figures

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Cited by in corpus (18)

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• Relative efficiency of polariton emission in two-dimensional materials
• Negative refraction in hyperbolic hetero-bicrystals
• Manipulation and steering of hyperbolic surface polaritons in hexagonal boron nitride
• Plasmonics in topological insulators: Spin-charge separation, the influence of the inversion layer, and phonon-plasmon coupling
• Electrical detection of hyperbolic phonon-polaritons in heterostructures of graphene and boron nitride
• Internal nanostructure diagnosis with hyperbolic phonon polaritons in hexagonal boron nitride
• Gate-Variable Mid-Infrared Optical Transitions in a $(B{i}_{1-x}S{b}_x{)}_{2}T{e}_3$ Topological Insulator
• Time-linear scaling NEGF methods for real-time simulations of interacting electrons and bosons. II. Dynamics of polarons and doublons
• Interaction of edge exciton polaritons with engineered defects in the van der Waals material Bi2Se3
• Hyperbolic phonon polaritons and wave vector direction dependent dielectric tensors in anisotropic crystals
• Flat and Correlated Plasmon Bands in Graphene/$\alpha$-RuCl${}_3$ Heterostructures
• High-index and low-loss topological insulators for mid-infrared nanophotonics
• Charge-Transfer Hyperbolic Polaritons in $\alpha$-MoO${}_3$/graphene heterostructures
• Real-space nanoimaging of THz polaritons in the topological insulator Bi2Se3
• Definition of Polaritonic Fluctuations in Natural Hyperbolic Media: Applications to Hexagonal Boron Nitride, Bismuth Selenide and the Spontaneous Emission Sum Rule
• Artifact Free Transient Near-Field Nanoscopy
• Strong Interaction of Cherenkov Radiation with Excitons in WSe2 Crystals