Study of Bose-Einstein condensate of magnons by means of fs-laser Faraday magnetometry

这个项目的主题是对玻色-爱因斯坦凝聚体--一种最近发现的磁振子气体的新状态--中相干度的实验研究。将采用一种组合外差方案作为实验工具，该方案使用重复的飞秒激光脉冲序列，允许最终频率分辨率。要回答的主要问题是：磁子的有限寿命及其相互作用如何影响凝聚体的相干性质。在这里，我们计划加入明斯特集团在相干磁振子态的实验研究中的专业知识，并结合奈梅亨集团在高频动力学、磁光和光磁方面的卓越研究和操作。

Subject of this project is the experimental investigation of the degree of coherence in the Bose-Einstein condensate – a recently discovered novel state of a magnon gas. A combined heterodyne scheme employing a repetitive sequence of fs-laser pulses, allowing an ultimate frequency resolution, will be applied as the experimental tool. The main question to answer will be: how the finite lifetime of magnons and their mutual interaction influences the coherent properties of the condensate. Here we plan to join the expertise of the Münster Group in experimental study of coherent magnon states with the excellence of the Nijmegen Group in investigation and manipulation of high frequency dynamics, magneto-optics and opto-magnetism.