The differential reflectance measurements and photoluminescence measurements were conducted at 5 K and at RT, respectively, using a custom-built confocal spectrometer. For differential reflectance measurements, samples were illuminated by the white light from broadband source (hydrogen-halogen lamp) focused into the spot of ~2 μm. Reflectance spectra from monolayer ReSe2 (RReSe2) and substrate (Rsub) were collected in confocal geometry. Differential reflectance spectra (DR) are obtained by DR = (RsubRReSe2)/Rsub. For photoluminescence measurements, samples were excited with a 532-nm laser through the 100× objective lens (numerical aperture of 0.9) with a power below 0.5 mW.

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