Surface plasmon polaritons in topological insulators

Junjie Qi, Haiwen Liu, and X. C. Xie
Phys. Rev. B 89, 155420 – Published 16 April 2014

Abstract

We study surface plasmon polaritons on a topological insulator-vacuum interface. When the time-reversal symmetry is broken due to ferromagnetic coupling, the surface states exhibit a magneto-optical Kerr effect. This effect gives rise to a novel transverse-type surface plasmon polariton, in addition to the longitudinal type. In specific, these two types contain three different channels, corresponding to the pole of the determinant of the Fresnel reflection matrix. All three channels of the surface plasmon polaritons display tight confinement and a long lifetime and show strong light-matter coupling with a dipole emitter.

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  • Received 22 September 2013
  • Revised 27 March 2014

DOI:https://doi.org/10.1103/PhysRevB.89.155420

©2014 American Physical Society

Authors & Affiliations

Junjie Qi1,2, Haiwen Liu2,3,*, and X. C. Xie2,3

  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2Collaborative Innovation Center of Quantum Matter, Beijing, China
  • 3International Center for Quantum Materials and School of Physics, Peking University, Beijing 100871, China

  • *haiwen.liu@pku.edu.cn

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Issue

Vol. 89, Iss. 15 — 15 April 2014

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