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Nanocavity-induced trion emission from atomically thin WSe2.
Zhuo Wang1, Yuanda Liu2, Dao Chen3
1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China. wzhuo@szu.edu.cn.
Scientific Reports
|September 23, 2022
Summary
Researchers generated charged excitons called trions in monolayer WSe2 using a gold plasmonic nanocavity. This breakthrough enables better manipulation of excitons for future electronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Excitons, bosonic quasiparticles, are crucial for optoelectronics but difficult to control electronically due to their neutral charge.
- Existing methods for exciton manipulation are limited, hindering the development of advanced electronic devices.
Purpose of the Study:
- To demonstrate the generation of charged excitons (trions) with enhanced exciton resonance in monolayer WSe2.
- To explore a novel method for manipulating excitons using plasmonic nanocavities for potential applications in all-exciton circuits.
Main Methods:
- Fabrication of a gold plasmonic nanocavity by sandwiching monolayer WSe2 between gold nanoparticles and a gold film.
- Utilizing hot carrier transport from the nanocavity to excite trions in the WSe2 material.
Main Results:
- Successfully generated negatively charged trions in monolayer WSe2.
- Achieved enhanced exciton resonance within the plasmonic nanocavity structure.
- Demonstrated a method for electronic manipulation of excitons via trion generation.
Conclusions:
- The nanocavity-induced trions offer a viable pathway for controlling excitons, overcoming their inherent charge-neutrality limitations.
- This work paves the way for developing novel optoelectronic devices and all-exciton information processing circuits.
