Nature of long-lived moiré interlayer excitons in electrically tunable MoS$_{2}$/MoSe$_{2}$ heterobilayers
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Alexeev, Evgeny M. Purser, Carola M. Gilardoni, Carmem M. Kerfoot, James Chen, Hao Cadore, Alisson R. Rosa, Bárbara L. T. Feuer, Matthew S. G. Javary, Evans Hays, Patrick Watanabe, Kenji Taniguchi, Takashi Tongay, Seth Ariel Kara, Dhiren M. Atatüre, Mete Ferrari, Andrea C. |
| author_facet | Alexeev, Evgeny M. Purser, Carola M. Gilardoni, Carmem M. Kerfoot, James Chen, Hao Cadore, Alisson R. Rosa, Bárbara L. T. Feuer, Matthew S. G. Javary, Evans Hays, Patrick Watanabe, Kenji Taniguchi, Takashi Tongay, Seth Ariel Kara, Dhiren M. Atatüre, Mete Ferrari, Andrea C. |
| contents | Interlayer excitons in transition-metal dichalcogenide heterobilayers combine high binding energy and valley-contrasting physics with long optical lifetime and strong dipolar character. Their permanent electric dipole enables electric-field control of emission energy, lifetime, and location. Device material and geometry impacts the nature of the interlayer excitons via their real- and momentum-space configurations. Here, we show that interlayer excitons in MoS$_{2}$/MoSe$_{2}$ heterobilayers are formed by charge carriers residing at the Brillouin zone edges, with negligible interlayer hybridization. We find that the moiré superlattice leads to the reversal of the valley-dependent optical selection rules, yielding a positively valued g-factor and cross-polarized photoluminescence. Time-resolved photoluminescence measurements reveal that the interlayer exciton population retains the optically induced valley polarization throughout its microsecond-long lifetime. The combination of long optical lifetime and valley polarization retention makes MoS$_{2}$/MoSe$_{2}$ heterobilayers a promising platform for studying fundamental bosonic interactions and developing excitonic circuits for optical information processing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02708 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nature of long-lived moiré interlayer excitons in electrically tunable MoS$_{2}$/MoSe$_{2}$ heterobilayers Alexeev, Evgeny M. Purser, Carola M. Gilardoni, Carmem M. Kerfoot, James Chen, Hao Cadore, Alisson R. Rosa, Bárbara L. T. Feuer, Matthew S. G. Javary, Evans Hays, Patrick Watanabe, Kenji Taniguchi, Takashi Tongay, Seth Ariel Kara, Dhiren M. Atatüre, Mete Ferrari, Andrea C. Mesoscale and Nanoscale Physics Materials Science Interlayer excitons in transition-metal dichalcogenide heterobilayers combine high binding energy and valley-contrasting physics with long optical lifetime and strong dipolar character. Their permanent electric dipole enables electric-field control of emission energy, lifetime, and location. Device material and geometry impacts the nature of the interlayer excitons via their real- and momentum-space configurations. Here, we show that interlayer excitons in MoS$_{2}$/MoSe$_{2}$ heterobilayers are formed by charge carriers residing at the Brillouin zone edges, with negligible interlayer hybridization. We find that the moiré superlattice leads to the reversal of the valley-dependent optical selection rules, yielding a positively valued g-factor and cross-polarized photoluminescence. Time-resolved photoluminescence measurements reveal that the interlayer exciton population retains the optically induced valley polarization throughout its microsecond-long lifetime. The combination of long optical lifetime and valley polarization retention makes MoS$_{2}$/MoSe$_{2}$ heterobilayers a promising platform for studying fundamental bosonic interactions and developing excitonic circuits for optical information processing. |
| title | Nature of long-lived moiré interlayer excitons in electrically tunable MoS$_{2}$/MoSe$_{2}$ heterobilayers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2406.02708 |