Description
In this talk, I will discuss how new many-electron excited states emerge in MoSe$_2$ homobilayers when the lattice reconstructions evolve. Notably, we identify a new trion resonance that arises in the transition regime of lattice reconstruction, where gradual changes in atomic alignment between the layers occur. Magnetic field–dependent measurements, supported by first-principles calculations, indicate that the exciton forms at the K valley while the doped hole resides in the $\Gamma$-valley. First-principles calculations further indicate that two nearly degenerate exciton resonances can arise, localized at different sites within the moiré supercell. We propose that the new trion resonance is a ``charge-transfer" trion, in which the electron–hole pair is spatially separated from the doped hole. These novel trions offer promising opportunities for the optical control of spin arrays embedded in the moiré superlattice.
