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Manipulating nonlinear exciton polaritons in an atomically-thin semiconductor with artificial potential landscapes
Yuan Luo1, Quanbing Guo2, Xinyi Deng3
1State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, 100084, China.
Light, Science & Applications
|September 7, 2023
Summary
Researchers controlled exciton polaritons in 2D materials using artificial cavities. This manipulation enhances interaction strength and coherence, paving the way for advanced polaritonic devices and many-body physics studies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Optics
Background:
- Exciton polaritons in 2D materials are crucial for optoelectronics and quantum physics.
- Engineering polariton properties is essential for advancing this field.
- Atomically thin transition-metal dichalcogenide microcavities offer a promising platform.
Purpose of the Study:
- To demonstrate the manipulation of nonlinear polaritons using lithographically defined potential landscapes.
- To investigate the impact of artificial mesa cavities on polariton localization and properties.
- To explore enhanced polariton-exciton interaction and coherence.
Main Methods:
- Fabrication of monolayer WS2 microcavities with lithographically defined mesa structures.
- Photoluminescence spectroscopy to analyze polariton dispersions and confinement.
- Systematic variation of trapping sizes to study interaction strength and coherence.
Main Results:
- Deterministic on-site localization of polaritons was achieved using artificial mesa cavities.
- Polariton-exciton interaction strength was enhanced up to six times by managing spatial overlap.
- Coherence of trapped polaritons was significantly improved, showing spectral narrowing within the picosecond range.
Conclusions:
- Lithographically defined potential landscapes offer a versatile method for manipulating polariton nonlinearity and coherence.
- This approach enables enhanced polariton-exciton interactions and improved coherence in 2D materials.
- The study opens avenues for exploring many-body physics and developing novel 2D material-based polaritonic devices.
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