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Yao, Kaiyuan; Yanev, Emanuil; Chuang, Hsun-Jen; Rosenberger, Matthew R; Xu, Xinyi; Darlington, Thomas; McCreary, Kathleen M; Hanbicki, Aubrey T; Watanabe, Kenji; Taniguchi, Takashi; Jonker, Berend T; Zhu, Xiaoyang; Basov, D. N; Hone, James C; Schuck, P. James
ACS nano, 01/2020, Letnik: 14, Številka: 1Journal Article
We report continuous-wave second harmonic and sum frequency generation from two-dimensional transition metal dichalcogenide monolayers and their heterostructures with pump irradiances several orders of magnitude lower than those of conventional pulsed experiments. The high nonlinear efficiency originates from above-gap excitons in the band nesting regions, as revealed by wavelength-dependent second order optical susceptibilities quantified in four common monolayer transition metal dichalcogenides. Using sum frequency excitation spectroscopy and imaging, we identify and distinguish one- and two-photon resonances in both monolayers and heterobilayers. Data for heterostructures reveal responses from constituent layers accompanied by nonlinear signal correlated with interlayer transitions. We demonstrate spatial mapping of heterogeneous interlayer coupling by sum frequency and second harmonic confocal microscopy on heterobilayer MoSe2/WSe2.
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