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Tunable interaction between excitons and hybridized magnons in a layered semiconductor
Geoffrey M Diederich1,2, John Cenker2, Yafei Ren3
1Intelligence Community Postdoctoral Research Fellowship Program, University of Washington, Seattle, WA, USA.
Nature Nanotechnology
|December 28, 2022
Summary
Researchers precisely controlled exciton-magnon interactions in CrSBr, a magnetic semiconductor. They tuned these interactions using magnetic fields and strain, paving the way for advanced quantum magnonics applications.
Area of Science:
- Solid-state physics
- Quantum optics
- Materials science
Background:
- Exciton-magnon interactions are crucial for understanding solids and developing new technologies.
- Van der Waals magnetic semiconductors offer a promising platform for exploring these interactions.
- Controlling these interactions is key for applications in photospintronics and quantum transduction.
Purpose of the Study:
- To demonstrate precise control over coherent exciton-magnon interactions in the layered magnetic semiconductor CrSBr.
- To investigate the tunability of exciton coupling to both bright and dark magnons.
- To explore the impact of external stimuli like magnetic fields and strain on exciton-magnon dynamics.
Main Methods:
- Applying an external magnetic field in various directions relative to the crystal axes.
- Inducing uniaxial strain to modulate coupling and magnon dispersion.
- Observing changes in exciton-magnon interactions and magnon hybridization.
Main Results:
- Precise tuning of exciton coupling to bright and dark magnons was achieved by manipulating magnetic field direction.
- Magnon-magnon hybridization was utilized to couple excitons to optically dark magnon modes.
- Uniaxial strain modulated exciton-magnon coupling and magnon dispersion, leading to the emergence of a dispersionless dark magnon band at critical strain.
Conclusions:
- Demonstrated unprecedented control over opto-mechanical-magnonic coupling in CrSBr.
- Showcased the potential for predictable and controllable implementation of hybrid quantum magnonics.
- Highlighted the significance of van der Waals magnetic semiconductors for fundamental studies and future quantum technologies.
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