Laser & Photonics Reviews
08 July 2020
Topological Valley Hall Edge State Lasing
Hua Zhong1,2, Yongdong Li1, Daohong Song3, Yaroslav V. Kartashov4, Yiqi Zhang1,2, Yanpeng Zhang1, and Zhigang Chen3,5
1 Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi'an Jiaotong University, Xi'an, 710049 China
2 Guangdong Xi'an Jiaotong University Academy, Foshan, 528300 China
3 MOE Key Laboratory of Weak‐Light Nonlinear Photonics, TEDA Applied Physics Institute and School of Physics, Nankai University, Tianjin, 300457 China
4 Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow Region, 108840 Russia
5 Department of Physics and Astronomy, San Francisco State University, San Francisco, CA, 94132 USA
10.1002/lpor.202070038
In article number 2000001, Yiqi Zhang and co-workers have established a hexagon-shaped domain wall consisting of alternating deep and shallow sites in a honeycomb lattice, along which edge states arise due to the valley Hall effect. By introducing gain into the deep sites, lasing from a topologically protected edge state emerges and gradually spawns the whole domain wall after nonlinear competition.
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