Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.087401
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Funding
- European Research Council (ERC)-Project MULTISCOPE [614623]
- European Research Council (ERC)-Project Unlimit-2D [679288]
- MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [19H05790, 20H00354, 21H05233]
- Federal Ministry of Education and Science of Germany [13XP5053A]
- Chinese Academy of Sciences Hundred Talent Fund
- China Scholarship Council
- German Academic Exchange Service
- [DOE-SC0020653]
- [NSF-1955889]
- [NSF DMR-1552220]
- [NSF-1933214]
- European Research Council (ERC) [679288, 614623] Funding Source: European Research Council (ERC)
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In the exciton polariton system of transition-metal dichalcogenides, we establish a threefold coupling and investigate its spectral properties through experiments, revealing a rich multibranch structure that has not been observed before.
Excitons in atomically thin transition-metal dichalcogenides (TMDs) have been established as an attractive platform to explore polaritonic physics, owing to their enormous binding energies and giant oscillator strength. Basic spectral features of exciton polaritons in TMD microcavities, thus far, were conventionally explained via two-coupled-oscillator models. This ignores, however, the impact of phonons on the polariton energy structure. Here we establish and quantify the threefold coupling between excitons, cavity photons, and phonons. For this purpose, we employ energy-momentum-resolved photolumines-cence and spatially resolved coherent two-dimensional spectroscopy to investigate the spectral properties of a high-quality-factor microcavity with an embedded WSe2 van der Waals heterostructure at room temperature. Our approach reveals a rich multibranch structure which thus far has not been captured in previous experiments. Simulation of the data reveals hybridized exciton-photon-phonon states, providing new physical insight into the exciton polariton system based on layered TMDs.
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