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- Title
Giant room-temperature nonlinearities in a monolayer Janus topological semiconductor.
- Authors
Shi, Jiaojian; Xu, Haowei; Heide, Christian; HuangFu, Changan; Xia, Chenyi; de Quesada, Felipe; Shen, Hongzhi; Zhang, Tianyi; Yu, Leo; Johnson, Amalya; Liu, Fang; Shi, Enzheng; Jiao, Liying; Heinz, Tony; Ghimire, Shambhu; Li, Ju; Kong, Jing; Guo, Yunfan; Lindenberg, Aaron M.
- Abstract
Nonlinear optical materials possess wide applications, ranging from terahertz and mid-infrared detection to energy harvesting. Recently, the correlations between nonlinear optical responses and certain topological properties, such as the Berry curvature and the quantum metric tensor, have attracted considerable interest. Here, we report giant room-temperature nonlinearities in non-centrosymmetric two-dimensional topological materials—the Janus transition metal dichalcogenides in the 1 T' phase, synthesized by an advanced atomic-layer substitution method. High harmonic generation, terahertz emission spectroscopy, and second harmonic generation measurements consistently show orders-of-the-magnitude enhancement in terahertz-frequency nonlinearities in 1 T' MoSSe (e.g., > 50 times higher than 2H MoS2 for 18th order harmonic generation; > 20 times higher than 2H MoS2 for terahertz emission). We link this giant nonlinear optical response to topological band mixing and strong inversion symmetry breaking due to the Janus structure. Our work defines general protocols for designing materials with large nonlinearities and heralds the applications of topological materials in optoelectronics down to the monolayer limit. Electronic band topology may be leveraged to enhance nonlinear optical properties in monolayer semiconductors. Here, the authors report giant room-temperature nonlinearity enhancements in Janus transition metal dichalcogenides.
- Subjects
JANUS particles; NONLINEAR optical materials; SECOND harmonic generation; SEMICONDUCTORS; TERAHERTZ spectroscopy; MONOMOLECULAR films; HARMONIC generation; OPTOELECTRONICS
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-40373-z