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Real-color PL image of the nanosheet under low pumping power density.
Real-color PL image of the nanosheet under low pumping power density at room temperature (A) and under 409 kW/cm2 at 77K (B). The dashed lines in (B) denote the side edges of the nanosheet. The scale bars in (A) and (B) are 10 μm. (C) Schematic diagram of the nanosheet waveguide structures. (D) PL spectra at 77K under increasing levels of pumping power density of 77, 173, 241, 338 and 668 kW/cm2 from bottom to top.
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