Phonon-exciton Interactions in WSe2 under a quantizing magnetic field
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 19, 2020
- Source ID
- 10.1038/s41467-020-16934-x
Entities
People
- Chenhao Jin
- Chuanwei Zhang
- Dmitry Smirnov
- Kenji Watanabe
- Mark Blei
- Sefaattin Tongay
- Shengnan Miao
- Su-Fei Shi
- Takashi Taniguchi
- Tianmeng Wang
- Wang Yao
- Yunmei Li
- Yuze Meng
- Zhen Lian
- Zhenguang Lu
- Zhipeng Li
Organizations
- Air Force Office of Scientific Research
- American Chemical Society Petroleum Research Fund
- National Science Foundation