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Twist angle modifies the band alignment, screening, and interlayer (IL)coupling in twisted bilayers (tBLs) of transition metal dichalcogenides.Intermediate misorientation (twist angles > 15 degrees) bilayers (BLs) offer aunique opportunity to tune excitonic behavior within these concurrent physicalmechanisms but are seldom studied. In this paper, we measure many-bodyexcitonic complexes in monolayer (ML), natural BL, and tBL WSe2. Neutralbiexciton (XX) is observed in tBL, while being undetected in nonencapsulated MLand BL, demonstrating unique effects of disorder screening in tBLs. The XX aswell as charged biexciton are robust to thermal dissociation and arecontrollable by electrostatic doping. Vanishing of momentum-indirect ILexcitons with increasing electron doping is demonstrated in tBL, resulting fromthe near alignment of Q-K and K-K valleys. Intermediate misorientation samplesoffer a high degree of control of excitonic complexes while offeringpossibilities for studying exciton-phonon coupling, band alignment, andscreening.

Tuning exciton complexes in twisted bilayer WSe2 at intermediate misorientation