Extending exciton and trion lifetimes in MoSe$_{2}$ with a nanoscale plasmonic cavity
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arXiv
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| Format: | Preprint |
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2025
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| author | Chen, Grace H. Addhya, Anchita Hammock, Ian N. Kim, Philip High, Alexander A. |
| author_facet | Chen, Grace H. Addhya, Anchita Hammock, Ian N. Kim, Philip High, Alexander A. |
| contents | Excitons in transition metal dichalcogenides (TMDs) have extremely short, picosecond-scale lifetimes which hinders exciton thermalization, limits the emergence of collective coherence, and reduces exciton transport in optoelectronic devices. In this work, we explore an all-optical pathway to extend exciton lifetimes by placing MoSe$_2$ in a deep-subwavelength Fabry-Perot silver cavity. The cavity structure is designed to suppress radiative recombination from in-plane optical dipoles, such as bright excitons and trions. We observe a consistent decrease in photoluminescence (PL) linewidths of excitons and trions (~1 nm), along with a corresponding lifetime increase (~10 ps). We confirm the experimental observations arise purely from exciton-cavity interactions-etching back the top silver layer returns the PL linewidth and lifetimes return to their original values. Our study offers a pathway to engineer excited state lifetimes in 2D materials which can be utilized for studies of optically dark excitons and have potential applications for novel optoelectronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_17879 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Extending exciton and trion lifetimes in MoSe$_{2}$ with a nanoscale plasmonic cavity Chen, Grace H. Addhya, Anchita Hammock, Ian N. Kim, Philip High, Alexander A. Mesoscale and Nanoscale Physics Excitons in transition metal dichalcogenides (TMDs) have extremely short, picosecond-scale lifetimes which hinders exciton thermalization, limits the emergence of collective coherence, and reduces exciton transport in optoelectronic devices. In this work, we explore an all-optical pathway to extend exciton lifetimes by placing MoSe$_2$ in a deep-subwavelength Fabry-Perot silver cavity. The cavity structure is designed to suppress radiative recombination from in-plane optical dipoles, such as bright excitons and trions. We observe a consistent decrease in photoluminescence (PL) linewidths of excitons and trions (~1 nm), along with a corresponding lifetime increase (~10 ps). We confirm the experimental observations arise purely from exciton-cavity interactions-etching back the top silver layer returns the PL linewidth and lifetimes return to their original values. Our study offers a pathway to engineer excited state lifetimes in 2D materials which can be utilized for studies of optically dark excitons and have potential applications for novel optoelectronic devices. |
| title | Extending exciton and trion lifetimes in MoSe$_{2}$ with a nanoscale plasmonic cavity |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.17879 |