Multiple Orbitals in Transition Metal Dichalcogenide Heterostructures

Moiré superlattices in transition metal dichalcogenide (TMD) heterostructures are essential for tuning interactions in condensed matter systems. They provide a unique platform for studying emergent quasiparticles and quantum phases, as described by frameworks like the Hubbard model. In this study, we investigate interlayer valley excitons in a system featuring coupled moiré superlattices with multi-orbitals. It is revealed that the moiré lattice constant is the crucial point for the exciton energy. And the polarizations of excitons can be easily tuned by electric field. Moreover, we discovered charged excitonic species specifically existing in the heterostructures we studied. These findings open new avenues for exploring electrically tunable multi-orbital moiré potentials, potentially leading to the discovery of novel exotic topological phases in TMD systems.