Direct observation of valley-polarized topological edge states in designer surface plasmon crystals

Nature Communications
Xiaoxiao WuWeijia Wen

Abstract

The extensive research of two-dimensional layered materials has revealed that valleys, as energy extrema in momentum space, could offer a new degree of freedom for carrying information. Based on this concept, researchers have predicted valley-Hall topological insulators that could support valley-polarized edge states at non-trivial domain walls. Recently, several kinds of photonic and sonic crystals have been proposed as classical counterparts of valley-Hall topological insulators. However, direct experimental observation of valley-polarized edge states in photonic crystals has remained difficult until now. Here, we demonstrate a designer surface plasmon crystal comprising metallic patterns deposited on a dielectric substrate, which can become a valley-Hall photonic topological insulator by exploiting the mirror-symmetry-breaking mechanism. Topological edge states with valley-dependent transport are directly visualized in the microwave regime. The observed edge states are confirmed to be fully valley-polarized through spatial Fourier transforms. Topological protection of the edge states at sharp corners is also experimentally demonstrated.

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Feb 27, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Shao-Yong HuoHong-Bo Huang
May 22, 2018·Advanced Materials·Zhen GaoBaile Zhang
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Jan 27, 2018·Scientific Reports·Yuting YangZhi Hong Hang
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Mar 15, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhi-Guo GengXue-Feng Zhu
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