Coherent Interaction of 2s and 1s Exciton States in Transition-Metal Dichalcogenide Monolayers
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910991017574400 |
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| author | Wegerhoff, Max Scharfstädt, Moritz Linden, Stefan Bergschneider, Andrea |
| author_facet | Wegerhoff, Max Scharfstädt, Moritz Linden, Stefan Bergschneider, Andrea |
| contents | We use femtosecond pump-probe spectroscopy to study the coherent interaction of excited exciton states in WSe2 and MoSe2 monolayers via the optical Stark effect. For co-circularly polarized pump and probe, we measure a blueshift which points to a repulsive interaction between the 2s and 1s exciton states. The determined 2s-1s interaction strength is on par with that of the 1s-1s, in agreement with the semiconductor Bloch equations. Furthermore, we demonstrate the existence of a 2s-1s biexciton bound state in the cross-circular configuration in both materials and determine their binding energy. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_12966 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coherent Interaction of 2s and 1s Exciton States in Transition-Metal Dichalcogenide Monolayers Wegerhoff, Max Scharfstädt, Moritz Linden, Stefan Bergschneider, Andrea Mesoscale and Nanoscale Physics We use femtosecond pump-probe spectroscopy to study the coherent interaction of excited exciton states in WSe2 and MoSe2 monolayers via the optical Stark effect. For co-circularly polarized pump and probe, we measure a blueshift which points to a repulsive interaction between the 2s and 1s exciton states. The determined 2s-1s interaction strength is on par with that of the 1s-1s, in agreement with the semiconductor Bloch equations. Furthermore, we demonstrate the existence of a 2s-1s biexciton bound state in the cross-circular configuration in both materials and determine their binding energy. |
| title | Coherent Interaction of 2s and 1s Exciton States in Transition-Metal Dichalcogenide Monolayers |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.12966 |