Higher-order quantum spin Hall effect in a photonic crystal

Biye Xie, Guangxu Su, Hong-Fei Wang, Feng Liu, Lumang Hu, Si-Yuan Yu, Peng Zhan (), Ming-Hui Lu (), Zhenlin Wang () and Yan-Feng Chen ()
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Biye Xie: Nanjing University
Guangxu Su: Nanjing University
Hong-Fei Wang: Nanjing University
Feng Liu: Kwansei Gakuin University
Lumang Hu: Nanjing University
Si-Yuan Yu: Nanjing University
Peng Zhan: Nanjing University
Ming-Hui Lu: Nanjing University
Zhenlin Wang: Nanjing University
Yan-Feng Chen: Nanjing University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract The quantum spin Hall effect lays the foundation for the topologically protected manipulation of waves, but is restricted to one-dimensional-lower boundaries of systems and hence limits the diversity and integration of topological photonic devices. Recently, the conventional bulk-boundary correspondence of band topology has been extended to higher-order cases that enable explorations of topological states with codimensions larger than one such as hinge and corner states. Here, we demonstrate a higher-order quantum spin Hall effect in a two-dimensional photonic crystal. Owing to the non-trivial higher-order topology and the pseudospin-pseudospin coupling, we observe a directional localization of photons at corners with opposite pseudospin polarizations through pseudospin-momentum-locked edge waves, resembling the quantum spin Hall effect in a higher-order manner. Our work inspires an unprecedented route to transport and trap spinful waves, supporting potential applications in topological photonic devices such as spinful topological lasers and chiral quantum emitters.

Date: 2020
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DOI: 10.1038/s41467-020-17593-8

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