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arXiv 2109.11206cond-mat.quant-gas
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复平面上的Efimov物理

Efimov physics in the complex plane

Mingyuan Sun, Chang Liu, Zhe-Yu Shi

AI总结:

本文研究复散射长度描述的两体损耗对Efimov三体束缚态的影响,发现三聚体能量可具有正实部并遵循广义几何标度律,且某些三体束缚态寿命长于两体态甚至趋于无穷大。

摘要:

Efimov效应的特征是在两体共振处存在遵循普适几何标度律的无限个三体束缚态。在本文中,我们研究了可以用复散射长度$a_c$描述的两体损耗对这些态的影响。有趣的是,由于散射长度$a_c$的复数性质,三聚体能量不再被限制在负实轴上,它被允许具有非零的虚部,以及可能超过三体或原子-二聚体散射阈值的实部。实际上,通过以$^{133}$Cs-$^{133}$Cs-$^6$Li系统为具体例子,我们通过求解广义Skorniakov-Ter-Martirosian方程计算了三聚体能量,并发现了这种能量具有正实部且遵循广义几何标度律的三体束缚态。值得注意的是,我们还发现在某些区域,与相应的两体束缚态相比,这些三体束缚态具有更长的寿命。这些三聚体态的寿命甚至可以趋于无穷大。我们的工作为未来在复平面上探索少体束缚态铺平了道路。

英文摘要:

Efimov effect is characterized by an infinite number of three-body bound states following a universal geometric scaling law at two-body resonances. In this paper, we investigate the influence of two-body loss which can be described by a complex scattering length $a_c$ on these states. Interestingly, because of the complexity of the scattering length $a_c$, the trimer energy is no longer constrained on the negative real axis, and it is allowed to have a nonvanishing imaginary part and a real part which may exceed the three-body or the atom-dimer scattering threshold. Indeed, by taking the $^{133}$Cs-$^{133}$Cs-$^6$Li system as a concrete example, we calculate the trimer energies by solving the generalized Skorniakov-Ter-Martirosian equation and find such three-body bound states with energies that have positive real parts and obey a generalized geometric scaling law. Remarkably, we also find that in some regions these three-body bound states have longer lifetimes compared with the corresponding two-body bound states. The lifetimes for these trimer states can even tend to infinity. Our work paves the way for the future exploration of few-body bound states in the complex plane.

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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