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arXiv 0907.2888cond-mat.quant-gascond-mat.str-el
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超冷原子费米气体中的巡游铁磁性

Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

Gyu-Boong Jo, Ye-Ryoung Lee, Jae-Hoon Choi, Caleb A. Christensen, Tony H. Kim, Joseph H. Thywissen, David E. Pritchard, Wolfgang Ketterle

摘要:

自旋向上和自旋向下的费米子组成的气体会因为排斥作用而变成铁磁性吗?这个问题还没有找到一个明确的理论答案,在一个用超冷双组分费米气体进行的实验中得到了解决。观察到的非单调行为的寿命,动能,和大小增加排斥相互作用提供了强有力的证据相变到铁磁状态。这意味着在没有晶格和能带结构的情况下,离域费米子的巡游铁磁性是可能的,并验证了Stoner提出的铁磁性的最基本模型。

英文摘要:

Can a gas of spin-up and spin-down fermions become ferromagnetic due to repulsive interactions? This question which has not yet found a definitive theoretical answer was addressed in an experiment with an ultracold two-component Fermi gas. The observation of non-monotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. It implies that itinerant ferromagnetism of delocalized fermions is possible without lattice and band structure and validates the most basic model for ferromagnetism introduced by Stoner.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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