Eur. Phys. J. D (2012) 66: 139
https://doi.org/10.1140/epjd/e2012-20678-3

Regular Article

Effect of interspecies interactions on the collision properties of bright-bright solitons in two-species Bose-Einstein condensates

¹ Department of Physics, Xiangtan University, Xiangtan 411105, P.R. China
² College of Electronic Science Engineering, Nanjing University of Post & Telecommunication, Nanjing 211106, P.R. China

^a e-mail: dlwang@xtu.edu.cn

Received: 25 November 2011
Received in final form: 23 February 2012
Published online: 23 May 2012

Abstract

Considering the time-dependent interspecies interactions, we study the collision properties of bright-bright solitons in two species Bose-Einstein condensates with the harmonic external potentials. It is shown that the collision behaviors of bright-bright solitons can be controlled by adjusting the strength of interspecies interaction and transverse trapping frequency of harmonic potential. Interestingly, the two separate solitons can merge into a single bound complex due to the stronger attractive interspecies interactions. Especially, a transmission collision is obtained from not only attractive but also repulsive interspecies interaction, different from previous theory. When the interspecies interaction is exponentially decreased, a reflection-transmission collision transition is observed for the repulsive interspecies interaction. Meanwhile, an experimental protocol is designed to observe the collision behaviors of the bright-bright solitons in the currently experimental conditions.