Plechinger, Gerd and Korn, Tobias and Lupton, John M. (2017) Valley-Polarized Exciton Dynamics in Exfoliated Monolayer WSe2. JOURNAL OF PHYSICAL CHEMISTRY C, 121 (11). pp. 6409-6413. ISSN 1932-7447,
Full text not available from this repository. (Request a copy)Abstract
Semiconducting transition-metal dichalcogenide monolayers have emerged as promising candidates for future valleytronics-based quantum information technologies. Two distinct momentum states of tightly bound electron-hole pairs in these materials can be deterministically initialized via irradiation with circularly polarized light. Here we investigate the ultrafast dynamics of such a valley polarization in monolayer tungsten diselenide by means of time-resolved Kerr reflectometry. The observed Kerr signal in our sample stems exclusively from charge-neutral excitons. Our findings support the picture of a fast decay of the valley polarization of bright excitons due to radiative recombination, intraconduction-band spin-flip transitions, intervalley-scattering processes, and the formation of long-lived valley-polarized dark states.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL DICHALCOGENIDES; SPIN COHERENCE; MOS2; SEMICONDUCTOR; ELECTRONS; WS2; PHOTOLUMINESCENCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:00 |
| Last Modified: | 20 Feb 2019 10:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/206 |
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