期刊
NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-26715-9
关键词
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资金
- State of Lower Saxony
- European Research Council (ERC) [679288]
- NSF [DMR 1955889, DMR 1933214, 1904716]
- Westlake University [041020100118]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [2018R01002]
- MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP19H05790, JP20H00354]
- China Scholarship Council
- German Academic Exchange Service
- Royal Society [IEC\R2\202148]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [INST 93/932-1 FUGG]
- University of Oldenburg through a Carl-von-Ossietzky fellowship
- [DOE-SC0020653]
- [DMR 2111812]
- [ECCS 2052527]
The study demonstrates a strong light-matter coupling regime between microcavity photons and excitons in an atomically thin WSe2. Coherence buildup is accompanied by a threshold-like behavior in the emitted light intensity, characteristic of a polariton laser effect. Valley physics is also evident in the manipulation of polaritons via the valley-Zeeman effect in the presence of an external magnetic field.
The emergence of spatial and temporal coherence of light emitted from solid-state systems is a fundamental phenomenon intrinsically aligned with the control of light-matter coupling. It is canonical for laser oscillation, emerges in the superradiance of collective emitters, and has been investigated in bosonic condensates of thermalized light, as well as exciton-polaritons. Our room temperature experiments show the strong light-matter coupling between microcavity photons and excitons in atomically thin WSe2. We evidence the density-dependent expansion of spatial and temporal coherence of the emitted light from the spatially confined system ground-state, which is accompanied by a threshold-like response of the emitted light intensity. Additionally, valley-physics is manifested in the presence of an external magnetic field, which allows us to manipulate K and K' polaritons via the valley-Zeeman-effect. Our findings validate the potential of atomically thin crystals as versatile components of coherent light-sources, and in valleytronic applications at room temperature. Here, the authors show that the interaction between microcavity photons and excitons in an atomically thin WSe2 results in a hybridized regime of strong light-matter coupling. Coherence build-up is accompanied by a threshold-like behaviour of the emitted light intensity, which is a fingerprint of a polariton laser effect.
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