Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides
Abstract The multivalley band structure of monolayer transition metal dichalcogenides (TMDs) gives rise to intravalley and intervalley excitons. Much knowledge of these excitons has been gained, but fundamental questions remain, such as how to describe them all in a unified picture with their correl...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-03-01
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| Series: | npj 2D Materials and Applications |
| Online Access: | https://doi.org/10.1038/s41699-022-00290-z |
| _version_ | 1828878473536471040 |
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| author | Hoang Ngoc Cam Nguyen Thanh Phuc Vladimir A. Osipov |
| author_facet | Hoang Ngoc Cam Nguyen Thanh Phuc Vladimir A. Osipov |
| author_sort | Hoang Ngoc Cam |
| collection | DOAJ |
| description | Abstract The multivalley band structure of monolayer transition metal dichalcogenides (TMDs) gives rise to intravalley and intervalley excitons. Much knowledge of these excitons has been gained, but fundamental questions remain, such as how to describe them all in a unified picture with their correlations, how are those from different valleys coupled to form the intervalley biexciton? To address the issues, we derive an exciton Hamiltonian from interpair correlations between the constituent carriers-fermions of two excitons. Identifying excitons by irreducible representations of their point symmetry group, we find their pairwise interaction depending on interacting excitons’ symmetry. It is generally repulsive, except for the case excitons from different valleys, which attract each other to form the intervalley biexciton. We establish a semianalytical relationship between the biexciton binding energy with exciton mass and dielectric characteristics of the material and surroundings. Overall, by providing insight into the nature of diverse excitons and their correlations, our theoretical model captures the exciton interaction properties permitting an inclusive description of the structure and energy features of the intervalley biexciton in monolayer TMDs. |
| first_indexed | 2024-12-13T09:06:25Z |
| format | Article |
| id | doaj.art-f16e003d45bf4a8eb289a2a4b4e999ac |
| institution | Directory Open Access Journal |
| issn | 2397-7132 |
| language | English |
| last_indexed | 2024-12-13T09:06:25Z |
| publishDate | 2022-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj 2D Materials and Applications |
| spelling | doaj.art-f16e003d45bf4a8eb289a2a4b4e999ac2022-12-21T23:53:03ZengNature Portfolionpj 2D Materials and Applications2397-71322022-03-016111110.1038/s41699-022-00290-zSymmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenidesHoang Ngoc Cam0Nguyen Thanh Phuc1Vladimir A. Osipov2Institute of Physics, Vietnam Academy of Science and TechnologyDepartment of Molecular Engineering, Graduate School of Engineering, Kyoto UniversityBogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear ResearchAbstract The multivalley band structure of monolayer transition metal dichalcogenides (TMDs) gives rise to intravalley and intervalley excitons. Much knowledge of these excitons has been gained, but fundamental questions remain, such as how to describe them all in a unified picture with their correlations, how are those from different valleys coupled to form the intervalley biexciton? To address the issues, we derive an exciton Hamiltonian from interpair correlations between the constituent carriers-fermions of two excitons. Identifying excitons by irreducible representations of their point symmetry group, we find their pairwise interaction depending on interacting excitons’ symmetry. It is generally repulsive, except for the case excitons from different valleys, which attract each other to form the intervalley biexciton. We establish a semianalytical relationship between the biexciton binding energy with exciton mass and dielectric characteristics of the material and surroundings. Overall, by providing insight into the nature of diverse excitons and their correlations, our theoretical model captures the exciton interaction properties permitting an inclusive description of the structure and energy features of the intervalley biexciton in monolayer TMDs.https://doi.org/10.1038/s41699-022-00290-z |
| spellingShingle | Hoang Ngoc Cam Nguyen Thanh Phuc Vladimir A. Osipov Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides npj 2D Materials and Applications |
| title | Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| title_full | Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| title_fullStr | Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| title_full_unstemmed | Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| title_short | Symmetry-dependent exciton-exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| title_sort | symmetry dependent exciton exciton interaction and intervalley biexciton in monolayer transition metal dichalcogenides |
| url | https://doi.org/10.1038/s41699-022-00290-z |
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