Plasmon Spectrum of Single Layer Antimonene

Abstract

The collective excitation spectrum of two-dimensional (2D) antimonene is calculated beyond the low energy continuum approximation. The dynamical polarizability is computed using a 6-orbitals tight-binding model that properly accounts for the band structure of antimonene in a broad energy range. Electron-electron interaction is considered within the random phase approximation. The obtained spectrum is rich, containing the standard intra-band 2D plasmon and a set of single inter-band modes. We find that spin-orbit interaction plays a fundamental role in the reconstruction of the excitation spectrum, with the emergence of novel inter-band branches in the continuum that interact with the plasmon.

arXiv comment8 pages, 9 figures, accepted by Phys. Rev. B

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• Plasmonic Waveguides from Coulomb-Engineered Two-Dimensional Metals
• Low-loss two-dimensional plasmon modes in antimonene
• Magic angle and plasmon mode engineering in twisted trilayer graphene with pressure