Excitonic Complexes in n-Doped WS2 Monolayer
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Date
2021-03-24
Authors
Zinkiewitz, Malgorzata
Wozniak, Tomasz
Kazimierczuk, Tomasz
Kapuscinski, Piotr
Oreszczuk, Kacper
Grzeszczyk, Magdalena
Bartoš, Miroslav
Nogajewski, Karol
Watanabe, Kenji
Taniguchi, Takashi
ORCID
0000-0002-5923-0260Advisor
Referee
Mark
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Volume Title
Publisher
American Chemical Society
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Abstract
We investigate the origin of emission lines apparent in the low-temperature photoluminescence spectra of n-doped WS2 monolayer embedded in hexagonal BN layers using external magnetic fields and first-principles calculations. Apart from the neutral A exciton line, all observed emission lines are related to the negatively charged excitons. Consequently, we identify emissions due to both the bright singlet and triplet) and dark (spin- and momentum-forbidden) negative trions as well as the phonon replicas of the latter optically inactive complexes. The semidark trions and negative biexcitons are distinguished. On the basis of their experimentally extracted and theoretically calculated g-factors, we identify three distinct families of emissions due to exciton complexes in WS,: bright, intravalley, and intervalley dark. The g-factors of the spin-split subbands in both the conduction and valence bands are also determined.
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Citation
NANO LETTERS. 2021, vol. 21, issue 6, p. 2519-2525.
https://pubs.acs.org/doi/10.1021/acs.nanolett.0c05021
https://pubs.acs.org/doi/10.1021/acs.nanolett.0c05021
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Peer-reviewed
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en