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Long-Range Directional Routing and Spatial Selection of High-Spin-Purity Valley Trion Emission in Monolayer WS₂.

Pei-Gang Chen¹, Zhiyong Li², Yun Qi³

¹Department of Materials Science and Engineering, The City University of Hong Kong, Hong Kong 999077, China.

|November 3, 2021

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We developed a novel valleytronic system using WS2 monolayers and microfibers for efficient optical data manipulation. This system enables long-range directional routing of valley excitations, advancing quantum optical technologies.

Area of Science:

Optoelectronics
Quantum Photonics
Materials Science

Background:

Transition metal dichalcogenides (TMDCs) offer valley-dependent optical properties for data manipulation.
Current methods using plasmonic nanostructures suffer from low quantum yield and high losses.

Purpose of the Study:

To demonstrate a high-performance valleytronic system for optical information transport.
To overcome limitations of existing TMDC-based valleytronic devices.

Main Methods:

Chiral coupling of WS2 monolayers with high trion emission quantum yield to a low-loss microfiber.
Utilizing waveguided mode spin properties for directional routing of valley excitations.

Main Results:

Achieved long-range directional routing of valley excitations.

Keywords:

TMDCs microfiber photonic spin−orbit interaction unidirectional transport valley polarization valley trions emission

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Demonstrated selective addressing of valley-dependent emission from the microfiber surface.

Integrated a high-quantum-yield WS2 monolayer system with a low-loss microfiber.

Conclusions:

The developed system merges valley polarization and chiral photonics for optical information transport.
This approach offers a promising alternative for classical and quantum optical communication devices.
The system is compatible with fiber communication infrastructure.