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Quantum-sized topological insulators/semimetals enable ultrahigh and broadband saturable absorption

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Nanoscale Horiz., 2023, 8,1686-1694
DOI: 10.1039/D3NH00282A, Communication
Zhexue Chen, Xinyu Sui, Zhangqiang Li, Yueqi Li, Xinfeng Liu, Yong Zhang
Topological insulator and semimetal QSs with monolayer structures and sub-4 nm lateral sizes demonstrate exceptional NSA performances with ultrahigh nonlinear response (72.4 and 68.4%) and ultralow power excitation (0.49 and 0.80 MW cm−2).
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