Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile.
J Phys Condens Matter. 2012 Jan 25;24(3):036006. doi: 10.1088/0953-8984/24/3/036006. Epub 2011 Dec 20.
A theory of the dynamics of the Bose-Einstein condensate of magnons is presented. It is shown that, despite magnon decay processes, ongoing during the condensate formation, the system manifests spontaneous quantum coherence with a pseudo-spin degree of freedom originated from the presence of two valleys in momentum space. Finally, a real space description of the condensed state is provided, revealing the condensate state as a spin density wave. The effective dynamics of the spinor condensate wavefunction is characterized, and it is shown to display Josephson-like relations.
提出了一种玻色-爱因斯坦磁振子凝聚体动力学理论。研究表明，尽管在凝聚体形成过程中存在磁振子衰减过程，但由于动量空间中存在两个谷，该系统表现出与赝自旋自由度相关的自发量子相干性。最后，提供了凝聚态的实空间描述，揭示了凝聚态为自旋密度波。同时，对自旋凝聚波函数的有效动力学进行了特征化，表明其表现出约瑟夫森类似关系。
