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arXiv 1409.0282cond-mat.quant-gasquant-ph
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玻色超流体与费米超流体相互作用能的标定

Calibration of Interaction Energy between Bose and Fermi Superfluids

Ren Zhang, Wei Zhang, Hui Zhai, Peng Zhang

摘要:

本文研究了在最近的冷原子实验中实现的玻色和费米混合超流体中的相互作用能。在玻色-爱因斯坦凝聚体(BEC)一侧的费米子原子之间的费什巴赫共振,这种相互作用能可以直接与玻色原子和费米子组成的二聚体之间的散射长度有关。我们计算了原子二聚体散射长度从三体分析与零程模型和可分离模型,包括范德华长度尺度,我们发现显着偏离的结果由平均场方法。我们还发现,原子与二聚体之间的多重散射可以解释这种偏差。我们的结果提供了一个校准的平均场相互作用能,这可以通过测量集体振荡频率的偏移来验证。

英文摘要:

In this letter we study the interaction energy in a mixture of Bose and Fermi superfluids realized in recent cold atom experiment. On the Bose-Einstein-condensate (BEC) side of a Feshbach resonance between fermionic atoms, this interaction energy can be directly related to the scattering length between a bosonic atom and a dimer composed of fermions. We calculate the atom-dimer scattering length from a three-body analysis with both a zero-range model and a separable model including the van der Waals length scale, and we find significant deviation from the result given by a mean-field approach. We also find that the multiple scattering between atom and dimer can account for such a deviation. Our results provide a calibration to the mean-field interaction energy, which can be verified by measuring the shift of collective oscillation frequency.

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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