Probing Exciton Dispersions of Freestanding Monolayer WSe<sub>2</sub> by Momentum-Resolved Electron Energy-Loss Spectroscopy
- Author(s)
- Jinhua Hong, Ryosuke Senga, Thomas Pichler, Kazu Suenaga
- Abstract
Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.
- Organisation(s)
- Electronic Properties of Materials
- External organisation(s)
- National Institute of Advanced Industrial Science and Technology (AIST)
- Journal
- Physical Review Letters
- Volume
- 124
- No. of pages
- 5
- ISSN
- 0031-9007
- DOI
- https://doi.org/10.1103/PhysRevLett.124.087401
- Publication date
- 09-2019
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103015 Condensed matter
- Keywords
- ASJC Scopus subject areas
- General Physics and Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/cebbc22d-a0a4-4de0-91f8-82ecc3326f3e