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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
7.9K
Optical Cooling of Magnons.
Sanchar Sharma1, Yaroslav M Blanter1, Gerrit E W Bauer1,2
1Kavli Institute of NanoScience, Delft University of Technology, 2628 CJ Delft, The Netherlands.
Physical Review Letters
|September 8, 2018
Summary
This study models cooling magnetic insulators using lasers. The laser light controls magnon temperature, potentially reducing magnetic order temperature with current technology.
Area of Science:
- Condensed Matter Physics
- Quantum Optics
- Materials Science
Background:
- Inelastic light scattering by spin waves (magnons) facilitates energy exchange between optical and magnetization fields.
- Magneto-optical resonators can enhance and control light-magnon interactions.
- Magnetic insulators like yttrium iron garnet are key materials for studying these phenomena.
Purpose of the Study:
- To model the laser-induced cooling of a magnetic insulator sphere.
- To investigate the temperature control of magnons via light intensity.
- To assess the feasibility of reducing magnetic order temperature using current technology.
Main Methods:
- Modeling inelastic light scattering in a magnetic insulator sphere.
- Utilizing a monochromatic laser source for excitation.
- Approximating optical fields as a Markovian bath for magnons under specific lifetime conditions (magnon >> optical lifetimes).
Main Results:
- The model predicts a steady-state magnon distribution governed by a temperature.
- This magnon temperature is directly controllable by the incident laser light intensity.
- The cooling process is shown to be effective in reducing the overall temperature of magnetic order.
Conclusions:
- Laser-driven inelastic light scattering offers a viable method for cooling magnetic materials.
- The proposed technique can significantly reduce the temperature of magnetic order.
- This cooling effect is achievable using existing technological capabilities.
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