Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2
Abstract The interactions between charges and excitons involve complex many-body interactions at high densities. The exciton-polaron model has been adopted to understand the Fermi sea screening of charged excitons in monolayer transition metal dichalcogenides. The results provide good agreement with...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-09-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-41475-4 |
| _version_ | 1827709543492091904 |
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| author | Xin Cong Parisa Ali Mohammadi Mingyang Zheng Kenji Watanabe Takashi Taniguchi Daniel Rhodes Xiao-Xiao Zhang |
| author_facet | Xin Cong Parisa Ali Mohammadi Mingyang Zheng Kenji Watanabe Takashi Taniguchi Daniel Rhodes Xiao-Xiao Zhang |
| author_sort | Xin Cong |
| collection | DOAJ |
| description | Abstract The interactions between charges and excitons involve complex many-body interactions at high densities. The exciton-polaron model has been adopted to understand the Fermi sea screening of charged excitons in monolayer transition metal dichalcogenides. The results provide good agreement with absorption measurements, which are dominated by dilute bright exciton responses. Here we investigate the Fermi sea dressing of spin-forbidden dark excitons in monolayer WSe2. With a Zeeman field, the valley-polarized dark excitons show distinct p-doping dependence in photoluminescence when the carriers reach a critical density. This density can be interpreted as the onset of strongly modified Fermi sea interactions and shifts with increasing exciton density. Through valley-selective excitation and dynamics measurements, we also infer an intervalley coupling between the dark trions and exciton-polarons mediated by the many-body interactions. Our results reveal the evolution of Fermi sea screening with increasing exciton density and the impacts of polaron-polaron interactions, which lay the foundation for understanding electronic correlations and many-body interactions in 2D systems. |
| first_indexed | 2024-03-10T17:23:26Z |
| format | Article |
| id | doaj.art-78fa1deb01744d36978553561872756e |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-10T17:23:26Z |
| publishDate | 2023-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-78fa1deb01744d36978553561872756e2023-11-20T10:16:12ZengNature PortfolioNature Communications2041-17232023-09-011411710.1038/s41467-023-41475-4Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2Xin Cong0Parisa Ali Mohammadi1Mingyang Zheng2Kenji Watanabe3Takashi Taniguchi4Daniel Rhodes5Xiao-Xiao Zhang6Department of Physics, University of FloridaDepartment of Physics, University of FloridaDepartment of Physics, University of FloridaResearch Center for Functional Materials, National Institute for Materials ScienceInternational Center for Materials Nanoarchitectonics, National Institute for Materials ScienceDepartment of Materials Science and Engineering, University of Wisconsin-MadisonDepartment of Physics, University of FloridaAbstract The interactions between charges and excitons involve complex many-body interactions at high densities. The exciton-polaron model has been adopted to understand the Fermi sea screening of charged excitons in monolayer transition metal dichalcogenides. The results provide good agreement with absorption measurements, which are dominated by dilute bright exciton responses. Here we investigate the Fermi sea dressing of spin-forbidden dark excitons in monolayer WSe2. With a Zeeman field, the valley-polarized dark excitons show distinct p-doping dependence in photoluminescence when the carriers reach a critical density. This density can be interpreted as the onset of strongly modified Fermi sea interactions and shifts with increasing exciton density. Through valley-selective excitation and dynamics measurements, we also infer an intervalley coupling between the dark trions and exciton-polarons mediated by the many-body interactions. Our results reveal the evolution of Fermi sea screening with increasing exciton density and the impacts of polaron-polaron interactions, which lay the foundation for understanding electronic correlations and many-body interactions in 2D systems.https://doi.org/10.1038/s41467-023-41475-4 |
| spellingShingle | Xin Cong Parisa Ali Mohammadi Mingyang Zheng Kenji Watanabe Takashi Taniguchi Daniel Rhodes Xiao-Xiao Zhang Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 Nature Communications |
| title | Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 |
| title_full | Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 |
| title_fullStr | Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 |
| title_full_unstemmed | Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 |
| title_short | Interplay of valley polarized dark trion and dark exciton-polaron in monolayer WSe2 |
| title_sort | interplay of valley polarized dark trion and dark exciton polaron in monolayer wse2 |
| url | https://doi.org/10.1038/s41467-023-41475-4 |
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