Departamento de Física, Universidade Federal de Pernambuco, Recife, PE 50670-901, Brazil.
J Phys Condens Matter. 2010 Apr 28;22(16):164211. doi: 10.1088/0953-8984/22/16/164211. Epub 2010 Mar 30.
Room temperature Bose-Einstein condensation (BEC) of magnons in YIG films under microwave driving has been recently reported. We present a theory for the interacting magnon gas driven out of equilibrium that provides rigorous support for the formation of the BEC. The theory relies on the cooperative mechanisms created by the nonlinear magnetic interactions and explains the spontaneous generation of quantum coherence and magnetic dynamic order when the microwave driving power exceeds a critical value. The results fit very well the experimental data for the intensity and the decay rate of Brillouin light scattering and for the microwave emission from the BEC as a function of driving power.
最近有报道称，在微波驱动下，YIG 薄膜中的室温玻色-爱因斯坦凝聚（BEC）已经实现。我们提出了一个用于描述非平衡相互作用的玻色子气体的理论，该理论为 BEC 的形成提供了严格的支持。该理论依赖于非线性磁相互作用所产生的协同机制，并解释了当微波驱动功率超过一个临界值时，量子相干和磁动力学有序的自发产生。实验结果与布里渊光散射强度和衰减率以及 BEC 的微波发射随驱动功率的函数关系的实验数据非常吻合。
