This study investigates the role of moiré potentials in van der Waals (vdW) heterostructures, focusing on interlayer excitons (IXs) in a high-quality MoSe₂/WSe₂ heterobilayer with a small rotational twist. The researchers observed multiple IX resonances with alternating circularly polarized emission, consistent with multiple exciton states confined within the moiré potential. The recombination dynamics and temperature dependence of these resonances support this interpretation. The results demonstrate the feasibility of engineering artificial excitonic crystals using vdW heterostructures for nanophotonics and quantum information applications. The study shows that the moiré potential, arising from lattice mismatch or rotational misalignment, can modulate the electronic and optical properties of vdW heterostructures. In MoSe₂/WSe₂ heterobilayers, the moiré potential leads to lateral confinement of interlayer excitons, resulting in multiple resonances with distinct optical selection rules. The depth of the moiré potential, estimated to be around 100-200 meV, is sufficient to localize interlayer excitons in a quantum dot-like potential. The spatial variation of the optical selection rules within the moiré supercell is responsible for the alternating circularly polarized emission observed in the experiments. The researchers performed micro-photoluminescence (PL) measurements on MoSe₂/WSe₂ heterobilayers and observed four spectrally resolved IX resonances in hBN-encapsulated samples. The IX resonances exhibited alternating co- and cross-circularly polarized emission, which is attributed to the unique spatial variation of the optical selection rules within the moiré supercell. The energy spacing of the resonances and the helicity of the emitted light are consistent with calculations of multiple IX states confined within a quantum dot-like potential with 100-200 meV lateral confinement. The study also shows that the moiré potential can influence the thermal behavior and recombination dynamics of interlayer excitons. The excited states decay faster than the ground states, consistent with the moiré potential's ability to confine excitons. The results highlight the potential of vdW heterostructures for creating artificial excitonic crystals and for applications in quantum information and nanophotonics. The findings suggest that the moiré potential can be tuned by adjusting the twist angle, offering a pathway for controlling exciton properties in these systems.This study investigates the role of moiré potentials in van der Waals (vdW) heterostructures, focusing on interlayer excitons (IXs) in a high-quality MoSe₂/WSe₂ heterobilayer with a small rotational twist. The researchers observed multiple IX resonances with alternating circularly polarized emission, consistent with multiple exciton states confined within the moiré potential. The recombination dynamics and temperature dependence of these resonances support this interpretation. The results demonstrate the feasibility of engineering artificial excitonic crystals using vdW heterostructures for nanophotonics and quantum information applications. The study shows that the moiré potential, arising from lattice mismatch or rotational misalignment, can modulate the electronic and optical properties of vdW heterostructures. In MoSe₂/WSe₂ heterobilayers, the moiré potential leads to lateral confinement of interlayer excitons, resulting in multiple resonances with distinct optical selection rules. The depth of the moiré potential, estimated to be around 100-200 meV, is sufficient to localize interlayer excitons in a quantum dot-like potential. The spatial variation of the optical selection rules within the moiré supercell is responsible for the alternating circularly polarized emission observed in the experiments. The researchers performed micro-photoluminescence (PL) measurements on MoSe₂/WSe₂ heterobilayers and observed four spectrally resolved IX resonances in hBN-encapsulated samples. The IX resonances exhibited alternating co- and cross-circularly polarized emission, which is attributed to the unique spatial variation of the optical selection rules within the moiré supercell. The energy spacing of the resonances and the helicity of the emitted light are consistent with calculations of multiple IX states confined within a quantum dot-like potential with 100-200 meV lateral confinement. The study also shows that the moiré potential can influence the thermal behavior and recombination dynamics of interlayer excitons. The excited states decay faster than the ground states, consistent with the moiré potential's ability to confine excitons. The results highlight the potential of vdW heterostructures for creating artificial excitonic crystals and for applications in quantum information and nanophotonics. The findings suggest that the moiré potential can be tuned by adjusting the twist angle, offering a pathway for controlling exciton properties in these systems.