Itinerant Ferromagnetism in a Fermi Gas of Ultracold Atoms

被引：268

作者：

Jo, Gyu-Boong ^{[1
]}

Lee, Ye-Ryoung ^{[1
]}

Choi, Jae-Hoon ^{[1
]}

Christensen, Caleb A. ^{[1
]}

Kim, Tony H. ^{[1
]}

Thywissen, Joseph H. ^{[2
]}

Pritchard, David E. ^{[1
]}

Ketterle, Wolfgang ^{[1
]}

机构：

[1] MIT, Harvard Ctr Ultracold Atoms, Elect Res Lab, Dept Phys, Cambridge, MA 02139 USA

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

SCIENCE | 2009年 / 325卷 / 5947期

关键词：

CONDENSATION; STATE;

D O I：

10.1126/science.1177112

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Can a gas of spin-up and spin-down fermions become ferromagnetic because of repulsive interactions? We addressed this question, for which there is not yet a definitive theoretical answer, in an experiment with an ultracold two-component Fermi gas. The observation of nonmonotonic behavior of lifetime, kinetic energy, and size for increasing repulsive interactions provides strong evidence for a phase transition to a ferromagnetic state. Our observations imply that itinerant ferromagnetism of delocalized fermions is possible without lattice and band structure, and our data validate the most basic model for ferromagnetism introduced by Stoner.

引用

页码：1521 / 1524

页数：4

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