Fine structure of charged moiré interlayer excitons in MoSe₂-WSe₂ heterostructures

Heterobilayers of transition metal dichalcogenide (TMD) such as MoSe₂ and WSe₂ provides a rich landscape for studying interlayer excitons (IXs) composed of bound electron-hole pairs localized in opposite layers. In the past five years, there have been numerous studies on twisted TMD bilayer samples, including reports moire trapping of single IXs and correlated states with integer filling effects. Recently, charged moire excitons have been reported, demonstrating the possibility of realizing optical control of electron spin in 2D heterostructure. Here, we report on the fine structure of moire-trapped IXs in MoSe₂/WSe₂ with controllable doping level. By varying the carrier density and magnetic field, we show that charged moire IXs exhibit an anomalous magnetic field dependence and investigate the origin of this effect through a combination of low temperature photoluminescence and reflection spectroscopies.