Formation of combined solitons in two-component Bose–Einstein condensates

doi:10.1088/1674-1056/19/8/080501

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 80501-080501.doi: 10.1088/1674-1056/19/8/080501

Formation of combined solitons in two-component Bose–Einstein condensates

李禄¹, 姚淑芳², 李秋艳³, 李再东³, 傅广生⁴

(1)College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China; (2)Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China; (3)Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China;School of Information Engineering, Hebei University of Technology, Tianjin 300401, China; (4)School of Information Engineering, Hebei University of Technology, Tianjin 300401, China

收稿日期:2009-10-24 修回日期:2010-03-15 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
Project supported by the Hundred Innovation Talents Supporting Fund of Hebei Province of China, the Natural Science Foundation of Hebei Province of China (Grant No. A2008000006), and the Natural Science Foundation of Shanxi Province of China (Grant No. 2007011007).

Formation of combined solitons in two-component Bose–Einstein condensates

Li Qiu-Yan(李秋艳)^a)b), Li Zai-Dong(李再东)^a)b)†ger, Yao Shu-Fang(姚淑芳)^a), Li Lu(李禄)^c), and Fu Guang-Sheng(傅广生)^b)‡

^a Department of Applied Physics, Hebei University of Technology, Tianjin 300401, China; ^b School of Information Engineering, Hebei University of Technology, Tianjin 300401, China; ^c College of Physics and Electronics Engineering, Shanxi University, Taiyuan 030006, China

Received:2009-10-24 Revised:2010-03-15 Online:2010-08-15 Published:2010-08-15
Supported by:
Project supported by the Hundred Innovation Talents Supporting Fund of Hebei Province of China, the Natural Science Foundation of Hebei Province of China (Grant No. A2008000006), and the Natural Science Foundation of Shanxi Province of China (Grant No. 2007011007).

摘要/Abstract

摘要： We investigate the combined soliton solutions of two-component Bose--Einstein condensates with external potential. The ``phase diagram'' is obtained for the formation regions of different combined solitons. Our results show that the intraspecies (interspecies) interaction strengths and the external trapped potential clearly affect the formation of dark--dark, bright--bright, and dark--bright soliton solutions in different regions. Especially, we find that the bright--bright (dark--dark) soliton can exist in the case of both repulsive (attractive) intraspecies interaction strengths in the presence of external potential. This novel phenomenon is completely different from the formation of soliton solution of one-component Bose--Einstein condensates without external potential, and it will be useful for the study of two-component Bose--Einstein condensates.

Abstract: We investigate the combined soliton solutions of two-component Bose–Einstein condensates with external potential. The ''phase diagram'' is obtained for the formation regions of different combined solitons. Our results show that the intraspecies (interspecies) interaction strengths and the external trapped potential clearly affect the formation of dark–dark, bright–bright, and dark–bright soliton solutions in different regions. Especially, we find that the bright–bright (dark–dark) soliton can exist in the case of both repulsive (attractive) intraspecies interaction strengths in the presence of external potential. This novel phenomenon is completely different from the formation of soliton solution of one-component Bose–Einstein condensates without external potential, and it will be useful for the study of two-component Bose–Einstein condensates.

Key words: Bose–Einstein condensates, combined solitons

中图分类号: (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

03.75.Lm

李秋艳, 李再东, 姚淑芳, 李禄, 傅广生. Formation of combined solitons in two-component Bose–Einstein condensates[J]. 中国物理B, 2010, 19(8): 80501-080501.

Li Qiu-Yan(李秋艳), Li Zai-Dong(李再东), Yao Shu-Fang(姚淑芳), Li Lu(李禄), and Fu Guang-Sheng(傅广生). Formation of combined solitons in two-component Bose–Einstein condensates[J]. Chin. Phys. B, 2010, 19(8): 80501-080501.

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Formation of combined solitons in two-component Bose–Einstein condensates

Formation of combined solitons in two-component Bose–Einstein condensates

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