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arXiv 1104.4408cond-mat.quant-gasphysics.atom-phquant-ph
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多组分囚禁原子和分子玻色-爱因斯坦凝聚体的同素费什巴赫共振相分离

Phase Separation of Multi-Component Bose-Einstein Condensates of Trapped Atoms and Molecules with a Homonuclear Feshbach Resonance

Ryosuke Shibato, Takushi Nishimura, Takayuki Watanabe, Toru Suzuki

摘要:

研究了具有同素费什巴赫共振的双组分原子和单组分分子的玻色-爱因斯坦凝聚体的相分离。建立了一个包含费什巴赫共振关联和各种粒子间相互作用的原子分子气体模型,并在经典场近似下,数值计算了零温下球谐振子阱中玻色-爱因斯坦凝聚的序参量.结果表明,费什巴赫共振可以引起两种类型的相分离。从原子主导区到分子主导区,预测了整个参数范围内囚禁气体的实际相结构和密度分布。我们着重于分子在相分离中的作用。特别是在原子占主导地位的政权,分子的作用是通过有效的相互作用来自我们的模型。此外,我们表明,微扰和半经典的限制,我们的模型再现了传统的原子BEC(单通道)模型。

英文摘要:

We investigate phase separation of Bose-Einstein condensates (BECs) of two-component atoms and one-component molecules with a homonuclear Feshbach resonance. We develop a full model for dilute atomic and molecular gases including correlation of the Feshbach resonance and all kinds of interparticle interactions, and numerically calculate order parameters of the BECs in spherical harmonic oscillator traps at zero temperature with the Bogoliubov's classical field approximation. As a result, we find out that the Feshbach resonance can induce two types of phase separation. The actual phase structures and density profiles of the trapped gases are predicted in the whole parameter region, from the atom dominant regime to the molecule dominant regime. We focus on the role of the molecules in the phase separation. Especially in the atom dominant regime, the role of the molecules is described through effective interactions derived from our model. Furthermore we show that a perturbative and semi-classical limit of our model reproduces the conventional atomic BEC (single-channel) model.

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