Extended Data Fig. 8: Repulsive and attractive dipolar interactions in free-standing WS2/WSe2 heterobilayer with twist angle of 53 degree (sample 3).
From: Enhanced interactions of interlayer excitons in free-standing heterobilayers
a, Measured excitation power dependent PL spectra from a free-standing WS2/WSe2 heterobilayer (H-type stacking, measured twist angle 53 ± 0.5°) at 83 K with 532 nm CW laser. Two interlayer exciton PL peaks are highlighted by blue and red arrows. b, Measured PL peak energy of interlayer exciton IX1 (blue balls) and IX2 (red balls) as a function of exciton density at 83 K. c, Extracted integrated PL intensity of IX1 and IX2 as a function of pumping power. From the fitting curve, integrated PL intensities of IX 1 and IX2 grew sub-linearly (α = 0.80) and super-linearly (α = 1.39), respectively, with the increase of excitation power. The error bars in (b) and (c) represent the fitting uncertainty (standard deviations) obtained from multiple (>3) fitting analysis.
