Observation of edge solitons in photonic graphene

Zhaoyang Zhang, Rong Wang, Yiqi Zhang (), Yaroslav V. Kartashov, Feng Li, Hua Zhong, Hua Guan, Kelin Gao, Fuli Li, Yanpeng Zhang () and Min Xiao ()
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Zhaoyang Zhang: Xi’an Jiaotong University
Rong Wang: Xi’an Jiaotong University
Yiqi Zhang: Xi’an Jiaotong University
Yaroslav V. Kartashov: Russian Academy of Sciences
Feng Li: Xi’an Jiaotong University
Hua Zhong: Xi’an Jiaotong University
Hua Guan: Chinese Academy of Sciences
Kelin Gao: Chinese Academy of Sciences
Fuli Li: Xi’an Jiaotong University
Yanpeng Zhang: Xi’an Jiaotong University
Min Xiao: University of Arkansas

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Edge states emerge in diverse areas of science, offering promising opportunities for the development of future electronic or optoelectronic devices, sound and light propagation control in acoustics and photonics. Previous experiments on edge states in photonics were carried out mostly in linear regimes, but the current belief is that nonlinearity introduces more striking features into physics of edge states, leading to the formation of edge solitons, optical isolation, making possible stable lasing in such states, to name a few. Here we report the observation of edge solitons at the zigzag edge of a reconfigurable photonic graphene lattice created via the effect of electromagnetically induced transparency in an atomic vapor cell with controllable nonlinearity. To obtain edge solitons, Raman gain is introduced to compensate strong absorption experienced by the edge state during propagation. Our observations may open the way for future experimental exploration of topological photonics on this nonlinear, reconfigurable platform.

Date: 2020
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DOI: 10.1038/s41467-020-15635-9

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