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Valley-addressable monolayer lasing through spin-controlled Berry phase photonic cavities
Xiaoyang Duan1, Bo Wang2, Kexiu Rong1
1Atomic-Scale Photonics Laboratory, Russell Berrie Nanotechnology Institute, and Helen Diller Quantum Center, Technion - Israel Institute of Technology, Haifa 3200003, Israel.
Science (New York, N.Y.)
|September 28, 2023
Summary
We demonstrated a room-temperature laser using a tungsten disulfide monolayer. Its lasing spin is controlled by the pump light
Area of Science:
- Condensed matter physics
- Materials science
- Nanophotonics
Background:
- Spin-valley coupling in transition metal dichalcogenides enables spin information control.
- Exploiting the valley degree of freedom is key for spin manipulation.
Purpose of the Study:
- To demonstrate a room-temperature, valley-addressable laser.
- To control the spin of lasing using the spin of pump light without magnetic fields.
Main Methods:
- Integrating a tungsten disulfide monolayer into a photonic cavity.
- Utilizing a photonic cavity supporting two orthogonal spin modes with high quality factors.
- Employing circularly polarized light to pump valley excitons.
Main Results:
- Achieved room-temperature lasing with spin-controlled output.
- Demonstrated valley-switchable radiation modes due to distinct laser thresholds.
- Observed broken population symmetry of valley excitons by spin-pumped lasing.
Conclusions:
- Developed a nanophotonic platform for coherent spin-light sources.
- Enabled active manipulation of spin-valley coupling in light-matter interactions.
- Provided a pathway for versatile room-temperature coherent spin-light sources.
