Condensing Magnons in a Degenerate Ferromagnetic Spinor Bose Gas

被引：20

作者：

Fang, Fang ^{[1
]}

Olf, Ryan ^{[1
]}

Wu, Shun ^{[1
]}

Kadau, Holger ^{[2
]}

Stamper-Kurn, Dan M. ^{[1
,3
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Stuttgart, Inst Phys 5, D-70550 Stuttgart, Germany

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 09期

基金：

美国国家科学基金会;

关键词：

SPONTANEOUS SYMMETRY-BREAKING; EINSTEIN CONDENSATION;

D O I：

10.1103/PhysRevLett.116.095301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We observe the quasicondensation of magnon excitations within an F = 1 Rb-87 spinor Bose-Einstein condensed gas. Magnons are pumped into a ferromagnetically ordered gas, allowed to equilibrate to a nondegenerate distribution, and then cooled evaporatively at near-constant net longitudinal magnetization, whereupon they condense. The critical magnon number, spatial distribution, and momentum distribution indicate that magnons condense in a potential that is uniform within the volume of the ferromagnetic condensate. The macroscopic transverse magnetization produced by the degenerate magnon gas remains inhomogeneous within the similar to 10 s equilibration time accessed in our experiment, and includes signatures of Mermin-Ho spin textures that appear as phase singularities in the magnon quasicondensate wave function.

引用

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