Nature
12 February 2020
Electrically pumped topological laser with valley edge modes
Yongquan Zeng1, Udvas Chattopadhyay2, Bofeng Zhu2, Bo Qiang1,2, Jinghao Li1, Yuhao Jin1, Lianhe Li3, Alexander Giles Davies3, Edmund Harold Linfield3, Baile Zhang2*, Yidong Chong2* & Qi Jie Wang
1 Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, Singapore, Singapore.
2 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
3 School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK.
10.1038/s41586-020-1981-x
By creating a triangular interface between two differently oriented photonic crystal lattices (as shown on the cover), the authors create topological edge states that can emit terahertz radiation even if there are sharp corners and defects present. As the laser is driven electrically, it could open the way for topological systems to find practical applications.
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