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  • Letter

Controllable topological edge mode in an optically excited exciton-polariton lattice

Haochen Wang1,*, Hang Zhou1,3,*,†, Song Luo1,3, Long Zhang1,2,‡, and Zhanghai Chen1,4,5,§

  • 1Department of Physics, College of Physical Science and Technology, Xiamen University, Xiamen 361005, China
  • 2State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
  • 3Jiujiang Research Institute of Xiamen University, Jiujiang 332000, China
  • 4Wuhan National High Magnetic Field Center, Wuhan 430074, China
  • 5Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China

  • *These authors contributed equally to this work.
  • †hangzhou@xmu.edu.cn
  • ‡zhanglong@xmu.edu.cn
  • §zhanghai@xmu.edu.cn
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Phys. Rev. B 106, L220305 – Published 14 December, 2022

DOI: https://doi.org/10.1103/PhysRevB.106.L220305

Abstract

We propose an all-optical scheme of topological lasing and switching based on the Aubry-André-Harper (AAH) model of an exciton-polariton chain. We theoretically show that the phase parameter of the optical potential, with a tunable effective quasimomentum, allows the system to exhibit nontrivial topological properties which are attributed to higher dimensions. The topological modes emerging within the bulk band gaps are spatially localized at the edges of the polariton lattice, and their topological properties are characterized by the nonzero Chern numbers of the bulk bands. Polariton lasing in topological edge modes exhibits a higher efficiency and better robustness than in bulk modes, and can be switched between two opposite edges of the lattice by nonresonant excitation, which paves a way for topologically protected optical circuits.

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Phys. Rev. B 106, L220305– Published 14 December, 2022
  • Received 9 June 2022
  • Revised 18 October 2022
  • Accepted 30 November 2022
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