Effect of the interspecies interaction on the density profiles of miscible two-species Bose-Einstein condensates

被引：4
作者：
Kuopanportti, P. [1 ]
Liu, Y. M. [2 ]
He, Y. Z. [3 ]
Bao, C. G. [3 ]
机构：
[1] Univ Helsinki, Dept Phys, POB 43, FIN-00014 Helsinki, Finland
[2] Shaoguan Univ, Dept Phys, Shaoguan 512005, Peoples R China
[3] Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China
来源：
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2019年 / 52卷 / 01期
基金：
中国国家自然科学基金; 芬兰科学院;
关键词：
Bose-Einstein condensation; multispecies condensate; Thomas-Fermi approximation; density profile; BINARY-MIXTURES; SEPARATION; VORTICES;
D O I：
10.1088/1361-6455/aaef9d
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We study harmonically trapped two-species Bose-Einstein condensates within the Gross-Pitaevskii formalism. By invoking the Thomas-Fermi approximation, we derive an analytical solution for the miscible ground state in a particular region of the system's parameter space. This solution furnishes a simple formula that relates the interspecies interaction strength to the second spatial moments of the density distribution of the minority condensate species. Accompanying numerical simulations confirm the accuracy of the solution and the interaction strength formula for sufficiently large numbers of condensed particles. The introduced formula may provide an additional scheme for determining interspecies scattering lengths that complements existing methods, such as those based on collective-excitation spectroscopy of the two-species condensates or on collisional measurements on thermal samples.
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页数：8
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