Boosting the surface conduction in a topological insulator

Taupin, Mathieu; Eguchi, G.; Lužnik, Monika; Steiger‐Thirsfeld, Andreas; Ishida, Y.; Kuroda, K.; Shin, Shik; Kimura, Akio; Paschen, S.

doi:10.1103/physrevb.107.235306

Cited by 1 publication

(1 citation statement)

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“…Electron bands of these materials open gaps, which corresponds to their dielectric responses in the bulk. However, the surface states are gapless, and the Fermi level intersects with them leading to surface conductivities in TIs [5][6][7][8][9][10]. Of course, external magnetic fields applied normal to the surface or some magnetic impurities could open gaps in the surface states [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Guiding infrared electromagnetic waves through TI nanowires with extremely large wavenumber and azimuthal index

Li,

Chen,

Dai

et al. 2024

J. Phys.: Condens. Matter

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In this paper, the dispersion relations of the surface plasmon polaritons in TI nanowires have been investigated. For simplicity, TI nanowire has been modeled as a dielectric cylinder with a conductive surface, the conductivity of which is an anti-symmetric tensor. The off-diagonal terms of the conductivity tensor only slightly change the dispersion relations. Due to small conductivities, these surface plasmon polaritons have extremely large wavenumbers and azimuthal indices; the electric fields are tightly confined near the conductive surface. For high-order modes, cut-off phenomena have been observed. In the end, the effects of losses and much larger bulk permittivities on the dispersion relations of surface plasmons have been discussed. The simple model proposed in this paper can be directly applied to other materials with arbitrary surface conductivity. Our investigations show that TI nanostructures are promising platforms for nanophotonic applications in the future.

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