Figure 1.

Linear optical and vibrational spectra of SL-WS₂. (a) UV–vis absorption (solid dark curve) and PL spectra (gray shaded region, excited at 532 nm). The dashed green curved shows the fitting of the absorption spectra by a polynomial baseline (dashed gray curve) and four Gaussian peaks, corresponding to the A, B, C, and D exciton resonances (red, orange, blue, and magenta, respectively). (b) Raman spectrum of SL-WS₂ with 532 nm excitation, with depictions of the in-plane and out-of-plane vibrational modes.