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We report the demonstration of electrically pumped Terahertz quantum cascade lasers based on topologically-protected valley edge states. Unlike previous topological lasers that relied on large-scale features to realize topological protection, we employ a compact valley photonic crystal design analogous to two-dimensional (2D) gapped valleytronic materials. Lasing occurs in a sharp-cornered triangular cavity with whispering gallery propagating modes. In addition, we experimentally demonstrate the electrically pumped topological lasers in a Majorana zero mode which shows a cylindrical vector beam single-mode lasing emission in the Terahertz regime.
Qi Jie Wang
"Electrically pumped topological quantum cascade lasers with topological protection and polarization control", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124301H (17 March 2023); https://doi.org/10.1117/12.2647786
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Qi Jie Wang, "Electrically pumped topological quantum cascade lasers with topological protection and polarization control," Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124301H (17 March 2023); https://doi.org/10.1117/12.2647786