Exciton transport in strained monolayer WSe2
Abstract
We experimentally demonstrate the visualization of exciton energy transport in a non-uniformly strained WSe2 monolayer by monitoring the propagation of exciton densities via spectrally, temporally, and spatially resolved photoluminescence measurements at room temperature. Our measurements indicate that excitons in the WSe2 monolayer exhibit anomalous diffusion due to disorder in the system, which leads to a time-varying diffusion coefficient. In addition, we show that the sensitivity of monolayer WSe2's bandgap to strain gives rise to a built-in excitonic potential that results in the funneling of excitons towards high tensile strain points. The observed drift and diffusion agree reasonably with our proposed model that takes into account the strain field on the monolayer to describe the exciton dynamics.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 17, 2018
- Source ID
- 10.1063/1.5063263
Entities
People
- Che-Hsuan Cheng
- Darwin F. Cordovilla Leon
- Parag B. Deotare
- Sung Woon Jang
- Zidong Li
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- University of Michigan