Observation of perovskite topological valley exciton-polaritons at room temperature

Feng Jin, Subhaskar Mandal, Jinqi Wu, Zhenhan Zhang, Wen Wen, Jiahao Ren, Baile Zhang, Timothy C. H. Liew (), Qihua Xiong () and Rui Su ()
Additional contact information
Feng Jin: 21 Nanyang Link
Subhaskar Mandal: 21 Nanyang Link
Jinqi Wu: 21 Nanyang Link
Zhenhan Zhang: 21 Nanyang Link
Wen Wen: 21 Nanyang Link
Jiahao Ren: 21 Nanyang Link
Baile Zhang: 21 Nanyang Link
Timothy C. H. Liew: 21 Nanyang Link
Qihua Xiong: Tsinghua University
Rui Su: 21 Nanyang Link

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Topological exciton-polaritons are a burgeoning class of topological photonic systems distinguished by their hybrid nature as part-light, part-matter quasiparticles. Their further control over novel valley degree of freedom (DOF) has offered considerable potential for developing active topological optical devices towards information processing. Here, employing a two-dimensional (2D) valley-Hall perovskite lattice, we report the experimental observation of valley-polarized topological exciton-polaritons and their valley-dependent propagations at room temperature. The 2D valley-Hall perovskite lattice consists of two mutually inverted honeycomb lattices with broken inversion symmetry. By measuring their band structure with angle-resolved photoluminescence spectra, we experimentally verify the existence of valley-polarized polaritonic topological kink states with a large gap opening of ~ 9 meV in the bearded interface at room temperature. Moreover, these valley-polarized states exhibit counter-propagating behaviors under a resonant excitation at room temperature. Our results not only expand the landscape of realizing topological exciton-polaritons, but also pave the way for the development of topological valleytronic devices employing exciton-polaritons with valley DOF at room temperature.

Date: 2024
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DOI: 10.1038/s41467-024-54658-4

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