Independent tuning of exciton g-factors and electric dipole moments in twisted MoS2/WS2 heterostructures

Twist-angle engineering of van der Waals heterobilayers is promising for designing quantum materials. However, establishing a microscopic framework connecting the geometry of moiré superlattices to experimentally accessible observables has remained unexplored. Here we report how the twist angle in MoS₂/WS₂ heterobilayers simultaneously shapes electronic, magnetic and dipolar responses. The moiré superlattice preserves monolayer spin-valley locking, whereas the long-range moiré potential traps electrons and holes in spatially separated stackings. The exciton g-factor is fixed by the local high-symmetry stacking, resulting in two discrete, opposite-sign Zeeman responses; the intrinsic electric dipole moment can be continuously modulated by the twist angle.

Citation: Wei Li, Gautam Jha, Thomas Brumme, Thomas Heine. (2025). "Independent tuning of exciton g-factors and electric dipole moments in twisted MoS2/WS2 heterostructures." ChemRxiv. doi:10.26434/chemrxiv-2023-g6v5r-v2.
[HTML]