Formation of Bose-Einstein magnon condensate via dipolar and exchange thermalization channels

被引：16
作者：
Bozhko, D. A. [1 ,2 ]
Clausen, P. [1 ]
Chumak, A. V. [1 ]
Kobljanskyj, Yu. V. [3 ]
Hillebrands, B. [1 ]
Serga, A. A. [1 ]
机构：
[1] Tech Univ Kaiserslautern, Fachbereich Phys & Landesforschungszentrum, OPTIMAS, D-67663 Kaiserslautern, Germany
[2] Grad Sch Mat Sci Mainz, D-67663 Kaiserslautern, Germany
[3] Taras Shevchenko Natl Univ Kyiv, Fac Radiophys Elect & Comp Syst, UA-01601 Kiev, Ukraine
来源：
LOW TEMPERATURE PHYSICS | 2015年 / 41卷 / 10期
关键词：
Bose-Einstein condensation - Spin waves - Brillouin scattering - Statistical mechanics;
D O I：
10.1063/1.4932354
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Thermalization of a parametrically driven magnon gas leading to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum was studied by time- and wavevector-resolved Brillouin light scattering spectroscopy. Two distinct channels of the thermalization process related on dipolar and exchange parts of a magnon gas spectrum are clearly determined. It has been found that the magnon population in these thermalization channels strongly depends on applied microwave pumping power. The observed magnon redistribution between the channels is caused by the downward frequency shift of the magnon gas spectrum due to the decrease of the saturation magnetization in the course of injection of parametrically pumped magnons. (C) 2015 AIP Publishing LLC.
引用
收藏
页码：801 / 805
页数：5
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