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Room-temperature exciton-polaritons with two-dimensional WS2.
L C Flatten1, Z He1, D M Coles1,2
1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom.
Scientific Reports
|September 20, 2016
Summary
Researchers achieved unambiguous exciton-polaritons in monolayer tungsten disulfide (WS2) coupled to a cavity at room temperature. This breakthrough, with a maximal Rabi splitting of 70 meV, paves the way for compact photonic devices for ambient applications.
Area of Science:
- Materials Science
- Quantum Optics
- Condensed Matter Physics
Background:
- Two-dimensional transition metal dichalcogenides (TMDs) possess strong optical transitions, making them promising for optoelectronics.
- Cavity quantum electrodynamics with TMDs can lead to polariton formation, enabling phenomena like inversionless lasing and superfluidity.
- Previous demonstrations often required cryogenic temperatures, high excitation, and suffered from material disorder, hindering room-temperature applications.
Purpose of the Study:
- To demonstrate unambiguous exciton-polaritons in monolayer WS2 at room temperature.
- To investigate strong coupling in a TMD-cavity system under ambient conditions.
- To establish a platform for studying strongly correlated polariton phenomena in compact photonic devices.
Main Methods:
- Coupling monolayer WS2 to an open Fabry-Perot cavity.
- Utilizing in-situ tunability of the cavity length.
- Characterizing polariton eigenstates and Rabi splitting through optical measurements.
- Modeling the system using a transfer matrix approach suitable for large linewidth regimes.
Main Results:
- Unambiguously displayed polariton eigenstates at room temperature.
- Achieved a maximal Rabi splitting of 70 meV, exceeding the exciton linewidth.
- Demonstrated strong coupling in a WS2-cavity system under ambient conditions.
- Validated experimental data with a transfer matrix model.
Conclusions:
- This study successfully realized well-resolved exciton-polaritons in a monolayer WS2-cavity system at room temperature.
- The achieved Rabi splitting surpasses the exciton linewidth, confirming strong coupling.
- The work provides a viable platform for exploring advanced polariton phenomena in scalable photonic devices for practical, room-temperature applications.
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