Observation of quasi-steady dark excitons and gap phase in a doped semiconductor
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912956731621376 |
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| author | Mo, Shangkun Bai, Yunfei Wu, Chunlong Cui, Xingxia Mei, Guangqiang Wan, Qiang Li, Renzhe Peng, Cao Zhao, Keming Qin, Dingkun Yu, Shuming Zhong, Hao Wang, Xingzhe Li, Enting Li, Yiwei Cao, Limin Feng, Min Meng, Sheng Xu, Nan |
| author_facet | Mo, Shangkun Bai, Yunfei Wu, Chunlong Cui, Xingxia Mei, Guangqiang Wan, Qiang Li, Renzhe Peng, Cao Zhao, Keming Qin, Dingkun Yu, Shuming Zhong, Hao Wang, Xingzhe Li, Enting Li, Yiwei Cao, Limin Feng, Min Meng, Sheng Xu, Nan |
| contents | Exciton plays an important role in optics and optics-related behaviors and leads to novel correlated phases like charge order, exciton insulator, and exciton-polariton condensation. Dark exciton shows distinct properties from bright one. However, it cannot be directly detected by conventional optic measurements. The electronic modulation effect of dark excitons in quasi-equilibrium distribution, critical for electronic devices in working status, is still elusive. Here, using angle-resolved photoemission spectroscopy, we report creating, detecting, and controlling dark excitons in the quasi-equilibrium distribution in a doped semiconductor SnSe2. Surprisingly, we observe an excitonic gap phase, with a conduction band opening an anisotropic gap. Our results broaden the scope of dark excitons, extending their studies from the picosecond timescale in the ultrafast photoemission process to conditions occurring under quasi-equilibrium. We reveal the light-matter interaction in the engineering of electronic structures and provide a new way to realize the excitonic gap phase in semiconductors with large band gaps. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_08419 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of quasi-steady dark excitons and gap phase in a doped semiconductor Mo, Shangkun Bai, Yunfei Wu, Chunlong Cui, Xingxia Mei, Guangqiang Wan, Qiang Li, Renzhe Peng, Cao Zhao, Keming Qin, Dingkun Yu, Shuming Zhong, Hao Wang, Xingzhe Li, Enting Li, Yiwei Cao, Limin Feng, Min Meng, Sheng Xu, Nan Materials Science Mesoscale and Nanoscale Physics Strongly Correlated Electrons Exciton plays an important role in optics and optics-related behaviors and leads to novel correlated phases like charge order, exciton insulator, and exciton-polariton condensation. Dark exciton shows distinct properties from bright one. However, it cannot be directly detected by conventional optic measurements. The electronic modulation effect of dark excitons in quasi-equilibrium distribution, critical for electronic devices in working status, is still elusive. Here, using angle-resolved photoemission spectroscopy, we report creating, detecting, and controlling dark excitons in the quasi-equilibrium distribution in a doped semiconductor SnSe2. Surprisingly, we observe an excitonic gap phase, with a conduction band opening an anisotropic gap. Our results broaden the scope of dark excitons, extending their studies from the picosecond timescale in the ultrafast photoemission process to conditions occurring under quasi-equilibrium. We reveal the light-matter interaction in the engineering of electronic structures and provide a new way to realize the excitonic gap phase in semiconductors with large band gaps. |
| title | Observation of quasi-steady dark excitons and gap phase in a doped semiconductor |
| topic | Materials Science Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.08419 |