Multi-Component Bose-Einstein Condensates: Theory

Eugene P. Bashkin, Alexei Vagov

Alexander Pritchard

Tomoya Isoshima, Kazushige Machida, Tetsuo Ohmi

Quantum vortices in the multi-component Bose-Einstein condensation (BEC) are investigated theoretically. It is found that three kinds of the vortex configurations are possible and their physical properties are discussed in details, including the density distribution and the spin texture. By using the Bogoliubov theory extended to the three component BEC, the collective modes for these vortices are evaluated. The local vortex stability for these vortices are examined in light of the existence of the negative eigenvalue, yielding a narrow magnetization window for the local intrinsic stable region where the multi-components work together to stabilize a vortex in a self-organized way.

Han Pu

Carlo F. Barenghi, Thomas Bland, Nick G. Parker

Xiao-Fei Zhang, Pei Zhang, Wan-Quan He +1 more

By using a unified theory of the formation of various types of vector-solitons in two-component Bose—Einstein condensates with tunable interactions, we obtain a family of exact vector-soliton solutions for the coupled nonlinear Schrödinger equations. Moreover, the Bogoliubov equation shows that there exists stable dark soliton in specific situations. Our results open up new ways in considerable experimental interest for the quantum control of multi-component Bose—Einstein condensates.