Extended Data Fig. 10: Repulsive and attractive dipolar interactions in a WS₂/WSe₂ heterobilayer with twist angle of 45 degree (sample 4).

a–c, Extracted PL peak energy as a function of excitation power, for three interlayer exciton peaks, labelled as IXX (a), IX 1 (b) and IX 2 (c). The inset in (b) shows the energy difference between IX1 and IXX as a function a excitation power. d, Extracted full width at half maximum (FWHM) of IXX, IX 1 and IX 2 as a function of excitation power. e, Extracted integrated PL intensity of three interlayer peaks as a function of excitation power, the fitting curve give rise to a slope of 1.58 for IXX (red), a slope of 1.01 for IX 1 (green) and a slope of 1.18 for IX 2 (purple). f, Extracted PL peak energy of the A excitons from the WS₂ layer in the heterobilayer, as a function of excitation power. The negligible energy shift of the A excitons from the WS₂ over the entire power range used (< 0.5 meV) suggests that the laser induced thermal effect in the power-dependent PL measurements was negligible and it does not affect the analysis of our power dependent PL results. The error bars in all the panels represent the fitting uncertainty (standard deviations) obtained from multiple (>3) fitting analysis.