Optomagnonic Barnett effect
arXiv:2004.03353 · doi:10.1103/PhysRevB.102.094417
Abstract
Combining the technologies of quantum optics and magnonics, we find that the circularly polarized laser can dynamically realize the quasiequilibrium magnon Bose-Einstein condensates (BEC). The Zeeman coupling between the laser and spins generates the optical Barnett field, and its direction is controllable by switching the laser chirality. We show that the optical Barnett field develops the total magnetization in insulating ferrimagnets with reversing the local magnetization, which leads to the quasiequilibrium magnon BEC. This laser-induced magnon BEC transition through optical Barnett effect, dubbed the optomagnonic Barnett effect, provides an access to coherent magnons in the high frequency regime of the order of terahertz. We also propose a realistic experimental setup to observe the optomagnonic Barnett effect using current device and measurement technologies as well as the laser chirping. The optomagnonic Barnett effect is a key ingredient for the application to ultrafast spin transport.
arXiv comment5+7 pages, 3 figures, 1 table
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- Gravitomagnetic Stern--Gerlach Force
- Optomagnonic Josephson effect in antiferromagnets
- Direct and alternating magnon spin currents across a junction interface irradiated by linearly polarized laser
- Optically induced static magnetic field in ensemble of nitrogen-vacancy centers in diamond