3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides
Abstract We observe both s-series and p-series excitons by using sum frequency generation spectroscopy on monolayer (1L-)MX2 (M = Mo, W, X = S, Se) encapsulated by hexagonal boron nitride (hBN). Moreover, we perform numerical calculations with the Rytova-Keldysh potential and obtain the relative die...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-77625-x |
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| author | S. Takahashi S. Kusaba K. Watanabe T. Taniguchi K. Yanagi K. Tanaka |
| author_facet | S. Takahashi S. Kusaba K. Watanabe T. Taniguchi K. Yanagi K. Tanaka |
| author_sort | S. Takahashi |
| collection | DOAJ |
| description | Abstract We observe both s-series and p-series excitons by using sum frequency generation spectroscopy on monolayer (1L-)MX2 (M = Mo, W, X = S, Se) encapsulated by hexagonal boron nitride (hBN). Moreover, we perform numerical calculations with the Rytova-Keldysh potential and obtain the relative dielectric constant of hBN among other parameters. The obtained relative dielectric constant can be approximated by the high-frequency limit of the infrared dispersion even though the exciton binding energies are almost on the phonon resonances in hBN. This suggests that the theoretically indicated modification of the exciton level structure due to the phonon resonances is negligible. The power-law scaling of exciton binding energies indicates that dielectric screening of 1L-MX2 exciton levels other than 1s can be approximated by that of a 3D hydrogen model with the dielectric constant of hBN. |
| format | Article |
| id | doaj-art-eddffb7e7f91494e952a61ecc041fc64 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-eddffb7e7f91494e952a61ecc041fc642025-01-19T12:24:47ZengNature PortfolioScientific Reports2045-23222024-11-0114111010.1038/s41598-024-77625-x3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenidesS. Takahashi0S. Kusaba1K. Watanabe2T. Taniguchi3K. Yanagi4K. Tanaka5Department of Physics, Kyoto UniversityDepartment of Physics, Kyoto UniversityResearch Center for Electronic and Optical Materials, National Institute for Materials ScienceResearch Center for Materials Nanoarchitectonics, National Institute for Materials ScienceDepartment of Physics, Tokyo Metropolitan UniversityDepartment of Physics, Kyoto UniversityAbstract We observe both s-series and p-series excitons by using sum frequency generation spectroscopy on monolayer (1L-)MX2 (M = Mo, W, X = S, Se) encapsulated by hexagonal boron nitride (hBN). Moreover, we perform numerical calculations with the Rytova-Keldysh potential and obtain the relative dielectric constant of hBN among other parameters. The obtained relative dielectric constant can be approximated by the high-frequency limit of the infrared dispersion even though the exciton binding energies are almost on the phonon resonances in hBN. This suggests that the theoretically indicated modification of the exciton level structure due to the phonon resonances is negligible. The power-law scaling of exciton binding energies indicates that dielectric screening of 1L-MX2 exciton levels other than 1s can be approximated by that of a 3D hydrogen model with the dielectric constant of hBN.https://doi.org/10.1038/s41598-024-77625-x |
| spellingShingle | S. Takahashi S. Kusaba K. Watanabe T. Taniguchi K. Yanagi K. Tanaka 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides Scientific Reports |
| title | 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides |
| title_full | 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides |
| title_fullStr | 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides |
| title_full_unstemmed | 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides |
| title_short | 3D hydrogen-like screening effect on excitons in hBN-encapsulated monolayer transition metal dichalcogenides |
| title_sort | 3d hydrogen like screening effect on excitons in hbn encapsulated monolayer transition metal dichalcogenides |
| url | https://doi.org/10.1038/s41598-024-77625-x |
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