Wagner, Koloman and Wietek, Edith and Ziegler, Jonas D. and Semina, Marina A. and Taniguchi, Takashi and Watanabe, Kenji and Zipfel, Jonas and Glazov, Mikhail M. and Chernikov, Alexey (2020) Autoionization and Dressing of Excited Excitons by Free Carriers in Monolayer WSe2. PHYSICAL REVIEW LETTERS, 125 (26): 267401. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
We experimentally demonstrate dressing of the excited exciton states by a continuously tunable Fermi sea of free charge carriers in a monolayer semiconductor. It represents an unusual scenario of two-particle excitations of charged excitons previously inaccessible in conventional material systems. We identify excited state trions, accurately determine their binding energies in the zero-density limit for both electron-and hole-doped regimes, and observe emerging many-body phenomena at elevated doping. Combining experiment and theory we gain access to the intra-exciton coupling facilitated by the interaction with free charge carriers. We provide evidence for a process of autoionization for quasiparticles, a unique scattering pathway available for excited states in atomic systems. Finally, we demonstrate a complete transfer of the optical transition strength from the excited excitons to dressed Fermi-polaron states as well as the associated light emission from their nonequilibrium populations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHARGED EXCITONS; TRIONS; ION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Junior Research Group Alexey Chernikov |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Mar 2021 07:35 |
| Last Modified: | 05 Mar 2021 07:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43110 |
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