Abstract

Recent advances in the studies of magnon gases have opened new horizons for the investigation of room-temperature macroscopic coherent states and discovery of Bose–Einstein condensation of magnons. Although the phenomenon has been discovered almost 15 years ago, a lot of important issues connected with magnon Bose–Einstein condensation remain unclear. Here I review the recent experimental achievements in investigations of this phenomenon. I show that the magnon condensate possesses high degrees of temporal and spatial coherency, the latter leading to observation of interference of two condensate. Discovery of second sound in magnon condensate is also discussed. Finally, I demonstrate a practical way to realize magnon laser, which create a freely propagating cloud of magnons.

中文翻译：

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室温下的Magnon BEC及其时空动力学

摘要

磁振子气体研究的最新进展为室温宏观相干态的研究和玻色-爱因斯坦磁化子凝结的发现开辟了新的视野。尽管这种现象已在15年前发现，但与磁振子玻色-爱因斯坦凝聚有关的许多重要问题仍不清楚。在这里，我回顾了研究这种现象的最新实验成果。我表明，磁振子凝结水具有高度的时间和空间相干性，后者导致观察到两个凝结水的干扰。还讨论了在磁振子冷凝物中发现第二种声音。最后，我演示了一种实现磁振子激光的实用方法，该方法可创建自由传播的磁振子云。