The spin evolution of spin-3 52Cr Bose–Einstein condensate

doi:10.1088/1674-1056/20/1/010310

中国物理B ›› 2011, Vol. 20 ›› Issue (1): 10310-010310.doi: 10.1088/1674-1056/20/1/010310

The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate

司徒树平, 贺彦章

State Key Laboratory of Optoelectronic Materials and Technologies, and School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China

收稿日期:2010-05-16 修回日期:2010-06-27 出版日期:2011-01-15 发布日期:2011-01-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10874249 and 11075223).

The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate

Situ Shu-Ping(司徒树平) and He Yan-Zhang(贺彦章)^†

State Key Laboratory of Optoelectronic Materials and Technologies, and School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China

Received:2010-05-16 Revised:2010-06-27 Online:2011-01-15 Published:2011-01-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10874249 and 11075223).

摘要/Abstract

摘要： This paper studies theoretically the spin evolution of a Bose--Einstein condensate starting from a mixture of two or three groups of ⁵²Cr (spin-3) atoms in an optical trap. The initial state is so chosen that the condensate has total magnetization zero so that the system does not distinguish up and down. It is assumed that the system is very dilute (particle number is very small), the temperature is very low, and the frequency of the harmonic trap is large enough. In these situations, the deviation caused by the neglect of the dipole--dipole interaction and by using the single-mode approximation is reduced. A theoretical calculation beyond the mean field theory is performed and the numerical results are helpful for the evaluation of the unknown strength g0.

关键词: Bose--Einstein condensate, spin evolution, short-ranged interaction strength

Abstract: This paper studies theoretically the spin evolution of a Bose–Einstein condensate starting from a mixture of two or three groups of ⁵²Cr (spin-3) atoms in an optical trap. The initial state is so chosen that the condensate has total magnetization zero so that the system does not distinguish up and down. It is assumed that the system is very dilute (particle number is very small), the temperature is very low, and the frequency of the harmonic trap is large enough. In these situations, the deviation caused by the neglect of the dipole–dipole interaction and by using the single-mode approximation is reduced. A theoretical calculation beyond the mean field theory is performed and the numerical results are helpful for the evaluation of the unknown strength g₀.

Key words: Bose–Einstein condensate, spin evolution, short-ranged interaction strength

中图分类号: (Multicomponent condensates; spinor condensates)

03.75.Mn

03.75.Kk (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow) 03.75.Nt (Other Bose-Einstein condensation phenomena) 05.30.Jp (Boson systems)

司徒树平, 贺彦章. The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate[J]. 中国物理B, 2011, 20(1): 10310-010310.

Situ Shu-Ping(司徒树平) and He Yan-Zhang(贺彦章). The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate[J]. Chin. Phys. B, 2011, 20(1): 10310-010310.

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The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate

The spin evolution of spin-3 ⁵²Cr Bose–Einstein condensate

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