Motion of a Bose-Einstein Condensate Bright Soliton Incident on a Step-Like Potential

赵立臣, 杨战营, 张 涛 +1 more

Xiaoli Peng, Xu Qiu, Yi Liang +2 more

Cheng Yong-Shan, Gong Rong-zhou, Hong Li

The motion characteristics of a Bose–Einstein condensate bright soliton incident on a local step-like potential barrier are investigated analytically by means of the variational approach. The dynamics of the soliton-potential interaction is studied as well. Then the results are verified by direct numerical simulations of the Gross–Pitaevskii equation. It is found that a moving bright soliton can be reflected from or pass over a step-like potential in a controllable fashion, the critical velocity depends on the width of the soliton and the parameters of the step, and the motion trajectory of the soliton does not depend on its phase. The atom density envelope of the soliton is changed as the result of the interaction between the soliton and the step-like potential.

Josselin C. Garnier, F. Kh. Abdullaev

He Zhang-Ming, Zhiqiang Zhang, Zhu Shan-Hua +1 more

We have studied the dynamic behavior of bright-bright solitons in two-species Bose-Einstein condensates trapped in an optical lattice. It is shown that the directions of motion and oscillations of the bright-bright solitons can be effectively controlled by adjusting the lattice spacing and height, respectively. Especially, two separated solitons can be localized in the optical lattice, and the fission of each localized soliton is newly observed due to the increase of the lattice height.

Yu Hui-You, Liuxian Pan, Jiaren Yan +1 more

The interaction of two bright matter solitons in two-component repulsive Bose–Einstein condensates with interspecies attraction is investigated using the variational approach. The effective interaction potential of the two solitons is obtained. It is shown that the interaction between the two solitons is a short-range attractive force. The relative motion of the two solitons and the oscillating angular frequency are also obtained.