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arXiv 1802.00129cond-mat.quant-gas
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四玻色子系统的谐波俘获

Harmonically Trapped Four-Boson System

D. Blume, M. W. C. Sze, J. L. Bohn

摘要:

考虑了四个全同无自旋玻色子在球对称简谐约束下的两体短程相互作用和三体相互作用。排斥性三体势阻止了具有分子特征的深束缚态的形成。详细分析了无限大二体$s$波散射长度下轨道角动量为零且宇称为正的低能谱。使用三体接触,状态被分类为普适,准普适或强非普适。与零程相互作用模型的连接进行了讨论。能谱被绘制为两体$s$ -波散射长度$a_s$,$a_s>0$的函数。在弱到中等强相互作用的制度,一个国家的方法获得的硬核相互作用模型的能量。这种状态被认为是能量最低的“BEC状态”。还介绍了结构特性。

英文摘要:

Four identical spinless bosons with purely attractive two-body short-range interactions and repulsive three-body interactions under external spherically symmetric harmonic confinement are considered. The repulsive three-body potential prevents the formation of deeply-bound states with molecular character. The low-energy spectrum with vanishing orbital angular momentum and positive parity for infinitely large two-body $s$-wave scattering length is analyzed in detail. Using the three-body contact, states are classified as universal, quasi-universal, or strongly non-universal. Connections with the zero-range interaction model are discussed. The energy spectrum is mapped out as a function of the two-body $s$-wave scattering length $a_s$, $a_s>0$. In the weakly- to medium-strongly-interacting regime, one of the states approaches the energy obtained for a hard core interaction model. This state is identified as the energetically lowest-lying "BEC state". Structural properties are also presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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