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Chiral Phonon Transport Induced by Topological Magnons.
Even Thingstad1, Akashdeep Kamra1, Arne Brataas1
1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Physical Review Letters
|April 2, 2019
Summary
Researchers explored topological magnon polarons in ferromagnets, revealing chiral edge modes with phononic properties. These findings suggest new methods for heat management in future devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Topological electronic insulators have spurred interest in similar boson systems.
- Ferromagnets on honeycomb lattices are predicted to host chiral edge magnons.
Purpose of the Study:
- To theoretically investigate the coupling between magnons and phonons in ferromagnets.
- To demonstrate the existence of chiral edge modes with phononic characteristics.
Main Methods:
- Theoretical study of magnon-phonon coupling.
- Analysis of topological magnon polarons at avoided crossings.
- Investigation of edge phonons in armchair ribbons.
Main Results:
- Identification of topological magnon polarons.
- Demonstration of chiral edge modes with phononic character.
- Prediction of chirality mediation in coherent phonon response.
Conclusions:
- Chiral edge modes with phononic character exist in these systems.
- These modes can mediate chirality in coherent phonon response.
- Potential applications in heat management for future devices.
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