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Electric-Field-Driven Trion Drift and Funneling in MoSe2 Monolayer
Seong Won Lee1,2, Woo Hun Choi1,2, HyunHee Cho1
1Department of Physics, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
Nano Letters
|May 11, 2023
Summary
Scientists demonstrate electric-field-driven movement of charged excitons (trions) in MoSe2 monolayers. This breakthrough enables new optoelectronic device possibilities by controlling trion motion.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Excitons, as electron-hole pairs in semiconductors, offer potential for information carriers using spin or valley properties.
- Manipulating exciton motion is difficult due to their neutral charge and brief recombination times.
Purpose of the Study:
- To demonstrate electric-field-driven drift and funneling of charged excitons (trions) in a MoSe2 monolayer.
- To explore a new method for controlling trion dynamics for optoelectronic applications.
Main Methods:
- Utilized a simple bottom-gate device to control electric fields around a suspended MoSe2 monolayer.
- Applied electric fields to influence trion density and induce layer deformation.
- Observed trion drift towards the center of the monolayer under continuous-wave excitation.
Main Results:
- Demonstrated successful electric-field-driven drift and funneling of trions in a MoSe2 monolayer.
- Quantified the electric force on trions, finding it significantly stronger (10^2-10^4 times) than strain-induced forces.
- Achieved continuous-wave observation of trion drift.
Conclusions:
- Electric field manipulation offers a viable strategy for controlling trion motion.
- This work opens avenues for novel optoelectronic devices based on controlled trion dynamics.
- The findings highlight the potential of MoSe2 monolayers in future electronic applications.
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