Tunable THz surface plasmon polariton based on a topological insulator/layered superconductor hybrid structure

Li, Mingda; Dai, Zuyang; Cui, Wenping; Wang, Zhe; Katmis, Ferhat; Wang, Jiayue; Le, P.T.T.; Zhu, Yimei

doi:10.1103/physrevb.89.235432

Cited by 3 publications

(3 citation statements)

References 44 publications

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“…The shape of the plasmon dispersion curves in TI slabs and double-layer graphene systems was a subject of many previous theoretical studies 31,37,40,43,44 whose basic conclusions are reproduced by the following analysis. To the right of the dashed lines in Fig.…”

Section: B Surface Plasmonsmentioning

confidence: 84%

“…Equation (9) is a good approximation at small µ. At large doping, trigonal warping 51 and other details of realistic band-structure 43 should be included. Since the above formula is a bit cumbersome, it may be helpful to mention some properties of σ(q, ω).…”

Section: Modelmentioning

confidence: 99%

“…The latter dominate the charge (and current) density response of the system at frequencies outside the hyperbolic band where HP 2 are absent. Dirac plasmons have been extensively studied in previous literature 8,13,14,[30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] on both TI and graphene. The basic properties of the Dirac plasmons can be introduced on the example of a hypothetical TI material with a frequencyindependent permittivity z > 0 and the permittivity ⊥ (ω) dominated by a single phonon mode.…”

Section: Introductionmentioning

confidence: 99%

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Topological insulators are tunable waveguides for hyperbolic polaritons

Basov

Fogler

2015

Phys. Rev. B

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We present a theoretical analysis showing that layered topological insulators, for example, Bi2Se3 are optically hyperbolic materials in a range of THz frequencies. As such, these topological insulators possess deeply subdiffractional, highly directional collective modes: hyperbolic phonon-polaritons. We predict that in thin crystals the dispersion of these 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. We also show that 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.

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Section: B Surface Plasmonsmentioning

confidence: 84%

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Topological insulators are tunable waveguides for hyperbolic polaritons

Basov

Fogler

2015

Phys. Rev. B

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Topological effect of surface plasmon excitation in gapped isotropic topological insulator nanowires

Cui

Meng

et al. 2015

Can. J. Phys.

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We present a theoretical investigation of the surface plasmon (SP) at the interface between a topologically nontrivial cylindrical core and a topologically trivial surrounding material, from the axion electrodynamics and modified constitutive relations. We find that the topological effect always leads to a red-shift of SP energy, while the energy red-shift decreases monotonically as core diameter decreases. A qualitative picture based on classical perturbation theory is given to explain these phenomena, from which we also infer that to enhance the shift, the difference between the inverse of dielectric constants of two materials must be increased. We also find that the surrounding magnetic environment suppresses the topological effect. All these features can be well described by a simple ansatz surface wave, which is in good agreement with full electromagnetic eigenmodes. In addition, bulk plasmon energy at p = 17.5 ± 0.2 eV for a semiconducting Bi 2 Se 3 nanoparticle is observed from high-resolution electron energy loss spectrum measurements. PACS Nos.: 73.20.Mf, 78.67.Uh. Résumé :Nous présentons une étude théorique du plasmon de surface (SP) à l'interface entre un coeur cylindrique topologiquement non trivial et un matériel enveloppant topologiquement trivial, à partir de l'électromagnétisme de l'axion et de relations constitutives modifiées. Nous trouvons que l'effet de la topologie mène toujours vers un déplacement vers le rouge de l'énergie et que ce même déplacement décroit de façon monotone lorsque le coeur rapetisse. Afin d'expliquer ce phénomène, nous proposons une vision qualitative basée sur la théorie classique des perturbations, d'où nous inférons que, pour augmenter le déplacement vers le rouge, la différence entre les inverses des constantes diélectriques des deux milieux doit augmenter. Nous trouvons également qu'un champ magnétique environnant détruit l'effet topologique. Tous ces phénomènes sont bien décrits par le simple ansatz d'une onde de surface, qui est en bon accord avec l'ensemble des modes propres électromagnétiques. De plus, nous observons par mesure du spectre d'énergie électronique perdue à haute résolution, que l'énergie du plasmon dans la nanoparticule semi-conductrice de Bi 2 Se 3 est p = 17.5 ± 0.2 eV. [Traduit par le Rédaction]

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Excitation of direction-tunable surface plasmon polaritons by using a rectangular array of silver nanodisks

et al. 2018

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Use of dipole-like localized surface plasmons (LSPs) induced on a rectangular array of silver nanodisks to excite directional surface plasmon polaritons (SPPs) on a flat silver film is demonstrated. By modifying the spectral resonance of the LSPs, an effective coupling of the incident light into the SPPs has been achieved at operational wavelength of λ = 628 nm. The maximum SPP intensity exceeds 25% of the incident intensity. Meanwhile, owing to the angle-dependent spatial distribution of the LSPs and the constructive interference between columns or rows of the array, the excited SPPs are supported to propagate in two orthogonal channels with a width of 1756 nm. Moreover, the propagation of the SPPs is tunable by rotating the polarization direction of the incident light between angles of 0 and π/2. This approach of launching direction-tunable SPPs shows great potential in applications of integrated plasmonic circuits.

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Tunable THz surface plasmon polariton based on a topological insulator/layered superconductor hybrid structure

Cited by 3 publications

References 44 publications

Topological insulators are tunable waveguides for hyperbolic polaritons

Topological insulators are tunable waveguides for hyperbolic polaritons

Topological effect of surface plasmon excitation in gapped isotropic topological insulator nanowires

Excitation of direction-tunable surface plasmon polaritons by using a rectangular array of silver nanodisks

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