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arXiv 1502.03963cond-mat.quant-gas
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氢原子中磁振子的玻色-爱因斯坦凝聚

Bose-Einstein condensation of magnons in atomic hydrogen gas

O. Vainio, J. Ahokas, J. Järvinen, L. Lehtonen, S. Novotny, S. Sheludiakov, K. -A. Suominen, S. Vasiliev, D. Zvezdov, V. V. Khmelenko, D. M. Lee

摘要:

本文报道了在自旋极化氢原子稠密气体中量子化电子自旋波(磁振子)的类玻色-爱因斯坦凝聚行为的实验观察。磁振子被非均匀磁场捕获和控制,并由类似薛定谔的波动方程描述,类似于中性原子的BEC实验。我们观察到ESR谱中出现了一个尖锐的特征,它偏离了正常的自旋波谱。我们认为,这一观察对应于突然增长的基态人口的磁振子和出现的自发相干氢气密度超过临界值,依赖于捕获的潜力。我们解释的结果作为一个BEC的非平衡磁振子是通过施加射频功率形成的。

英文摘要:

We report on experimental observation of BEC-like behaviour of quantized electron spin waves (magnons) in a dense gas of spin polarized atomic hydrogen. The magnons are trapped and controlled with inhomogeneous magnetic fields, and described by a Schrödinger-like wave equation, in analogy to the BEC experiments with neutral atoms. We have observed the appearance of a sharp feature in the ESR spectrum displaced from the normal spin wave spectrum. We believe that this observation corresponds to a sudden growth of the ground state population of the magnons and emergence of their spontaneous coherence for hydrogen gas densities exceeding a critical value, dependent on the trapping potential. We interpret the results as a BEC of non-equilibrium magnons which were formed by applying the rf power.

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