Enhancing Ground-State Population and Macroscopic Coherence of Room-Temperature WS_{2} Polaritons through Engineered...

Area of Science:

• Condensed Matter Physics
• Materials Science
• Optoelectronics

Background:

• Exciton polaritons in transition-metal dichalcogenide (TMD) monolayers are promising for optoelectronics.
• Key applications require trapping polaritons and achieving macroscopic ground state occupation.

Purpose of the Study:

• To engineer a trap for room-temperature exciton polaritons in an all-dielectric optical microcavity.
• To enhance polariton confinement, population, and coherence in the ground state.

Main Methods:

• Engineered an all-dielectric optical microcavity.
• Locally increased interactions between WS₂ excitons and cavity photons to create a polariton trap.
• Investigated population transfer into the trap via optical injection.

Main Results:

• Successfully engineered a room-temperature polariton trap.
• Achieved enhanced population and first-order coherence of polaritons in the ground state.
• Demonstrated efficient population transfer into the trap from outside its periphery.
• Observed suppression of disorder-induced inhomogeneous dephasing.

Conclusions:

• The engineered trap effectively confines room-temperature polaritons.
• Enhanced ground state population and coherence are crucial for polariton-based devices.
• The demonstrated population transfer mechanism is vital for practical device operation.