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Exciton dressing by extreme nonlinear magnons in a layered semiconductor
Geoffrey M Diederich1,2, Mai Nguyen1, John Cenker1
1Department of Physics, University of Washington, Seattle, WA, USA.
Nature Nanotechnology
|March 18, 2025
Summary
Researchers demonstrate extreme nonlinear optomagnonic coupling in CrSBr, observing excitons interacting with numerous magnon harmonics. This enables tunable optical sidebands and parametric magnon amplification for novel quantum and computing applications.
Area of Science:
- Condensed Matter Physics
- Quantum Optics
- Materials Science
Background:
- Collective excitations with nonlinear dynamics are crucial for applications like nonlinear optics.
- Van der Waals magnetic semiconductors offer new avenues for exploring light-matter interactions.
- Extreme nonlinearities in magnons are key to advanced optical phenomena.
Purpose of the Study:
- To demonstrate nonlinear optomagnonic coupling in van der Waals magnetic semiconductors.
- To investigate exciton-magnon interactions and their nonlinear behavior.
- To explore applications in magnonics, quantum systems, and neuromorphic computing.
Main Methods:
- Utilizing the layered antiferromagnetic semiconductor CrSBr.
- Observing exciton states dressed by multiple magnon harmonics.
- Employing sum- and difference-frequency generation with magnetic fields.
- Achieving parametric amplification of magnons through resonant interactions.
Main Results:
- Observed exciton states dressed by up to 20 harmonics of magnons, showcasing extreme nonlinearities.
- Generated tunable optical sidebands via nonlinear frequency mixing of magnon modes.
- Demonstrated parametric amplification of magnons by tuning difference-frequency generation into resonance.
- Realized modulation of optical excitons by microwave-frequency magnons.
Conclusions:
- Nonlinear optomagnonic coupling is achieved in CrSBr, driven by extreme magnon nonlinearities.
- The findings open possibilities for advanced magnonics, hybrid quantum systems, and optomagnonic neuromorphic computing.
- This work highlights the potential of van der Waals magnetic semiconductors for novel light-matter interactions.
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