Disorder of excitons and trions in monolayer MoSe2
Abstract
The optical spectra of transition metal dichalcogenide monolayers are dominated by excitons and trions. Here, we establish the dependence of these optical transitions on the disorder from hyperspectral imaging of h-BN encapsulated monolayer MoSe2. While both exciton and trion energies vary spatially, these two quantities are almost perfectly correlated, with spatial variation in the trion binding energy of only ∼0.18 meV. In contrast, variation in the energy splitting between the two lowest energy exciton states is one order of magnitude larger at ∼1.7 meV. Statistical analysis and theoretical modeling reveal that disorder results from dielectric and bandgap fluctuations, not electrostatic fluctuations. Our results shed light on disorder in high quality TMDC monolayers, its impact on optical transitions, and the many-body nature of excitons and trions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 01, 2022
- Source ID
- 10.1063/5.0108001
Entities
People
- Christina Manolatou
- Farhan Rana
- James C. Hone
- Jue Wang
- Xiaoyang Zhu
- Yusong Bai
Organizations
- Air Force Office of Scientific Research
- Columbia University
- Cornell University
- Division of Materials Research
- Office of Naval Research