Spin waves in ferromagnetically coupled spinor Bose gases

被引：26

作者：

Gu, Q ^{[1
]}

Bongs, K ^{[1
]}

Sengstock, K ^{[1
]}

机构：

[1] Univ Hamburg, Inst Laser Phys, D-22761 Hamburg, Germany

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 06期

关键词：

D O I：

10.1103/PhysRevA.70.063609

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

It is shown that the ferromagnetic transition takes place always above Bose-Einstein condensation in ferromagnetically coupled spinor Bose gases. We describe the Bose ferromagnet within Ginzburg-Landau theory by a "two-fluid" model below Bose-Einstein condensation. Both the Bose condensate and the normal component are spontaneously magnetized. As a main result we show that spin waves in the two fluids are coupled together so as to produce only one mixed spin-wave mode in the coexisting state. The spin-wave stiffness coefficient of the mixed mode, c(s), includes contributions from both the two phases, implying the "two-fluid" feature of the system. c(s) can show a sharp bend at the Bose-Einstein condensation temperature.

引用

页码：063609 / 1

页数：5

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