Electric-Field-Driven Trion Transport in Monolayer MoSe₂

Controlling the motion of trions using electric fields can be used for realizing excitonic and quantum optoelectronic circuits. Since neutral excitons are electrically inert, their motion cannot be directly controlled by external electric fields. Trions, being charged excitonic complexes, overcome this limitation and enable electric-field-driven transport in two-dimensional transition-metal dichalcogenides (TMDCs). We used graphene contacts to apply an in-plane electric field for inducing trion motion in an hBN-encapsulated monolayer MoSe₂.. The clean hBN/MoSe₂/hBN heterostructure, fabricated on an Si/SiO₂ substrate with a planarized gold back gate, enables uniform electrostatic control with minimal substrate-surface disorder. As the in-plane electric potential is varied from -15 V to +15 V, the trion photoluminescence peak shows a systematic displacement relative to the exciton peak, confirming field-induced trion drift with an extracted mobility of approximately 698 cm² V⁻¹ s⁻¹, advancing the development of low-power excitonic and valleytronic devices.