Emergence of 6-particle "hexciton'' states in WS$_2$ and MoSe$_2$ monolayers
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arXiv
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2023
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| author | Choi, J. Li, J. Van Tuan, D. Dery, H. Crooker, S. A. |
| author_facet | Choi, J. Li, J. Van Tuan, D. Dery, H. Crooker, S. A. |
| contents | When doped with a high density of mobile charge carriers, monolayer transition-metal dichalcogenide (TMD) semiconductors can host new types of composite many-particle exciton states that do not exist in conventional semiconductors. Such multi-particle bound states arise when a photoexcited electron-hole pair couples to not just a single Fermi sea that is quantum-mechanically distinguishable (as for the case of conventional charged excitons or trions), but rather couples simultaneously to \textit{multiple} Fermi seas, each having distinct spin and valley quantum numbers. Composite six-particle ``hexciton'' states were recently identified in electron-doped WSe$_2$ monolayers, but under suitable conditions they should also form in all other members of the monolayer TMD family. Here we present spectroscopic evidence demonstrating the emergence of many-body hexcitons in charge-tunable WS$_2$ monolayers (at the A-exciton) and MoSe$_2$ monolayers (at the B-exciton). The roles of distinguishability and carrier screening on the stability of hexcitons are discussed. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_09476 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Emergence of 6-particle "hexciton'' states in WS$_2$ and MoSe$_2$ monolayers Choi, J. Li, J. Van Tuan, D. Dery, H. Crooker, S. A. Mesoscale and Nanoscale Physics Materials Science When doped with a high density of mobile charge carriers, monolayer transition-metal dichalcogenide (TMD) semiconductors can host new types of composite many-particle exciton states that do not exist in conventional semiconductors. Such multi-particle bound states arise when a photoexcited electron-hole pair couples to not just a single Fermi sea that is quantum-mechanically distinguishable (as for the case of conventional charged excitons or trions), but rather couples simultaneously to \textit{multiple} Fermi seas, each having distinct spin and valley quantum numbers. Composite six-particle ``hexciton'' states were recently identified in electron-doped WSe$_2$ monolayers, but under suitable conditions they should also form in all other members of the monolayer TMD family. Here we present spectroscopic evidence demonstrating the emergence of many-body hexcitons in charge-tunable WS$_2$ monolayers (at the A-exciton) and MoSe$_2$ monolayers (at the B-exciton). The roles of distinguishability and carrier screening on the stability of hexcitons are discussed. |
| title | Emergence of 6-particle "hexciton'' states in WS$_2$ and MoSe$_2$ monolayers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2312.09476 |