| Title: |
Efficient light upconversion via resonant exciton-exciton annihilation of dark excitons in few-layer transition metal dichalcogenides |
| Authors: |
Chen, Yi-Hsun, Lo, Ping-Yuan, Boschen, Kyle W., Hsu, Chih-En, Hsu, Yung-Ning, Holtzman, Luke N., Peng, Guan-Hao, Huang, Chun-Jui, Holbrook, Madisen, Wang, Wei-Hua, Barmak, Katayun, Hone, James, Hawrylak, Pawel, Hsueh, Hung-Chung, Davis, Jeffrey A., Cheng, Shun-Jen, Fuhrer, Michael S., Chen, Shao-Yu |
| Publication Year: |
2024 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: |
In this work, we report a pronounced light upconversion in few-layer transition metal dichalcogenides. Our joint theory-experiment study attributes the upconversion photoluminescence to a resonant exciton-exciton annihilation involving a pair of dark excitons with opposite momenta, followed by the spontaneous emission of upconverted bright excitons, which can have a high upconversion efficiency. Additionally, the upconversion photoluminescence is generic in MoS2, MoSe2, WS2, and WSe2, showing a high tuneability from green to ultraviolet light. |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2409.03387 |
| Accession Number: |
edsarx.2409.03387 |
| Database: |
arXiv |
