Science Advances

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• Supplementary Text
• Fig. S1. 2D MoSe₂/WSe₂ heterostructure samples.
• Fig. S2. Determination of monolayer orientation via polarization-resolved SHG.
• Fig. S3. Determination of monolayer orientation via polarization-resolved SHG: The case of rotating laser polarization.
• Fig. S4. Low-temperature spectroscopy-microscopy setup.
• Fig. S5. Time resolution of TRPL and pump-probe experiments.
• Fig. S6. Calculated optical absorptances for monolayer WSe₂, monolayer MoSe₂, and WSe₂/MoSe₂ heterobilayer based on the reported dielectric constants in (17).
• Fig. S7. Calibration of steady-state excitation density.
• Fig. S8. Band structure model for the AA-stacked MoSe₂-WSe₂ heterolayer, including the high-symmetry points Γ and K, as well as the Q point in between.
• Fig. S9. Dielectric structure model.
• Fig. S10. PL of the misaligned heterostructure.
• Fig. S11. Comparison of steady-state and pulsed PL spectra at similar carrier densities.
• Fig. S12. Excitation density and temperature-dependent PL spectra from the WSe₂/MoSe₂ heterobilayer.
• Fig. S13. BN-encapsulated monolayer MoSe₂ and WSe₂ samples.
• Fig. S14. Electron-hole plasma dynamics in monolayers by transient reflectance.
• Table S1. Band edges, effective masses, and layer contributions for the AA-stacked MoSe₂-WSe₂ heterolayer according to the notation in fig. S8.
• References (43–49)

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