Bose-Einstein Condensation of Nonequilibrium Magnons in Confined Systems
arXiv:2002.09777 · doi:10.1088/1367-2630/aba98c
Abstract
We study the formation of a room temperature magnon Bose-Einstein condensate (BEC) in nanoscopic systems and demonstrate that its lifetime is influenced by the spatial confinement. We predict how dipolar interactions and nonlinear magnon scattering assist in the generation of a metastable magnon BEC in energy-quantized nanoscopic devices. We verify our prediction by a full numerical simulation of the Landau-Lifshitz-Gilbert equation and demonstrate the generation of magnon BEC in confined insulating magnets of yttrium iron garnet. We directly map out the nonlinear magnon scattering processes behind this phase transition to show how fast quantized thermalization channels allow the BEC formation in confined structures. Based on our results, we discuss a new mechanism to manipulate the BEC lifetime in nanoscaled systems. Our study greatly extends the freedom to study the dynamics of magnon BEC in realistic systems and to design integrated circuits for BEC-based applications at room temperature.
9 pages, 5 figures
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- Anisotropy-assisted magnon condensation in ferromagnetic thin films
- Entanglement properties of photon-magnon crystal from nonlinear perspective
- Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators
- Stability of chiral magnon condensates in collinear antiferromagnetic insulators
- Bose-Einstein condensate of Dirac magnons: Pumping and collective modes
- Nonequilibrium phase transition in a driven-dissipative quantum antiferromagnet