Phonon-exciton Interactions in WSe2 under a quantizing magnetic field

Zhipeng Li, Tianmeng Wang, Shengnan Miao, Yunmei Li, Zhenguang Lu, Chenhao Jin, Zhen Lian, Yuze Meng, Mark Blei, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Wang Yao, Dmitry Smirnov, Chuanwei Zhang and Su-Fei Shi ()
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Zhipeng Li: Rensselaer Polytechnic Institute
Tianmeng Wang: Rensselaer Polytechnic Institute
Shengnan Miao: Rensselaer Polytechnic Institute
Yunmei Li: The University of Texas at Dallas
Zhenguang Lu: National High Magnetic Field Lab
Chenhao Jin: Cornell University
Zhen Lian: Rensselaer Polytechnic Institute
Yuze Meng: Rensselaer Polytechnic Institute
Mark Blei: School for Engineering of Matter, Transport and Energy, Arizona State University
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Sefaattin Tongay: School for Engineering of Matter, Transport and Energy, Arizona State University
Wang Yao: University of Hong Kong
Dmitry Smirnov: National High Magnetic Field Lab
Chuanwei Zhang: The University of Texas at Dallas
Su-Fei Shi: Rensselaer Polytechnic Institute

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract Strong many-body interaction in two-dimensional transitional metal dichalcogenides provides a unique platform to study the interplay between different quasiparticles, such as prominent phonon replica emission and modified valley-selection rules. A large out-of-plane magnetic field is expected to modify the exciton-phonon interactions by quantizing excitons into discrete Landau levels, which is largely unexplored. Here, we observe the Landau levels originating from phonon-exciton complexes and directly probe exciton-phonon interaction under a quantizing magnetic field. Phonon-exciton interaction lifts the inter-Landau-level transition selection rules for dark trions, manifested by a distinctively different Landau fan pattern compared to bright trions. This allows us to experimentally extract the effective mass of both holes and electrons. The onset of Landau quantization coincides with a significant increase of the valley-Zeeman shift, suggesting strong many-body effects on the phonon-exciton interaction. Our work demonstrates monolayer WSe2 as an intriguing playground to study phonon-exciton interactions and their interplay with charge, spin, and valley.

Date: 2020
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DOI: 10.1038/s41467-020-16934-x

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