Electrically Tunable Exciton Dynamics and Coupling in Two-Dimensional Moiré Heterobilayers

Ping-Hau Chen¹, Shih-Chieh Lin¹, Yu-Cheng Lin¹, Hsuan-Yi Chen¹, Ro-Ya Liu², Chih-Ming Lin¹, Shangjr Gwo¹, Wei-Ting Hsu^1,2,3*

¹Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
²National Synchrotron Radiation Research Center, Hsinchu, Taiwan
³Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan

* Presenter:Wei-Ting Hsu, email:wthsu@phys.nthu.edu.tw

Transition metal dichalcogenide (TMD) moiré heterobilayers offer a versatile platform for exploring correlated excitonic phenomena and developing next-generation optoelectronic devices. In this work, we study gate-controlled exciton spectroscopy and dynamics in TMD moiré system. The field-tunable band alignment, together with the moiré superlattice, gives rise to unconventional exciton-exciton and exciton-charge interactions. By varying the gate voltage, we observe continuous modulation of charged exciton states, revealing strong Coulomb correlations governed by the moiré potential. These findings reveal new mechanisms for controlling moiré excitons, including tunable many-body scattering pathways and charge-mediated excitonic coupling. Together, these results establish a novel pathway toward electrically reconfigurable excitonic and quantum photonic systems, where exciton interactions can be dynamically engineered for on-chip light-matter manipulation.

Keywords: transition metal dichalcogenide, moiré heterobilayers, exciton dynamics, electrical tuning