一维二分量玻色子间的束缚
Binding between two-component bosons in one dimension
摘要：
我们研究了在简谐约束下的一维少原子玻色-玻色混合物体系的基态，研究了从弱到强的种间吸引力的过渡过程。计算是基于数值精确的多组态含时Hartree方法。对于排斥成分，我们详细的条件下形成的分子Tonks-Girardeau气体的中间物种间的相互作用的制度，和形成的分子凝聚体更强的耦合。除了一个临界的物种间吸引力，系统崩溃到一个整体的束缚状态。不同的途径出现不平等的粒子数和物种内的相互作用。特别是，对于具有一种吸引性组分的混合物，这种物质可以被视为另一种排斥性组分在陷阱中心的有效潜在凹坑。
英文摘要：
We investigate the ground state of one-dimensional few-atom Bose-Bose mixtures under harmonic confinement throughout the crossover from weak to strong inter-species attraction. The calculations are based on the numerically exact multi-configurational time-dependent Hartree method. For repulsive components we detail the condition for the formation of a molecular Tonks-Girardeau gas in the regime of intermediate inter-species interactions, and the formation of a molecular condensate for stronger coupling. Beyond a critical inter-species attraction, the system collapses to an overall bound state. Different pathways emerge for unequal particle numbers and intra-species interactions. In particular, for mixtures with one attractive component, this species can be viewed as an effective potential dimple in the trap center for the other, repulsive component.
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