Hybrid topological photonic crystals

Yanan Wang, Hai-Xiao Wang (), Li Liang, Weiwei Zhu, Longzhen Fan, Zhi-Kang Lin, Feifei Li, Xiao Zhang, Pi-Gang Luan, Yin Poo (), Jian-Hua Jiang () and Guang-Yu Guo ()
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Yanan Wang: Nanjing University
Hai-Xiao Wang: Guangxi Normal University
Li Liang: Nanjing University
Weiwei Zhu: Ocean University of China
Longzhen Fan: Nanjing University
Zhi-Kang Lin: Soochow University
Feifei Li: Nanjing University
Xiao Zhang: Nanjing University
Pi-Gang Luan: National Central University
Yin Poo: Nanjing University
Jian-Hua Jiang: Soochow University
Guang-Yu Guo: National Taiwan University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Topologically protected photonic edge states offer unprecedented robust propagation of photons that are promising for waveguiding, lasing, and quantum information processing. Here, we report on the discovery of a class of hybrid topological photonic crystals that host simultaneously quantum anomalous Hall and valley Hall phases in different photonic band gaps. The underlying hybrid topology manifests itself in the edge channels as the coexistence of the dual-band chiral edge states and unbalanced valley Hall edge states. We experimentally realize the hybrid topological photonic crystal, unveil its unique topological transitions, and verify its unconventional dual-band gap topological edge states using pump-probe techniques. Furthermore, we demonstrate that the dual-band photonic topological edge channels can serve as frequency-multiplexing devices that function as both beam splitters and combiners. Our study unveils hybrid topological insulators as an exotic topological state of photons as well as a promising route toward future applications in topological photonics.

Date: 2023
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DOI: 10.1038/s41467-023-40172-6

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