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arXiv 1111.1565cond-mat.quant-gasmath-phmath.MPnucl-th
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二维和三维超冷简谐囚禁原子的普适两体谱

Universal Two-Body Spectra of Ultracold Harmonically Trapped Atoms in Two and Three Dimensions

N. T. Zinner

摘要:

研究了两个超冷原子在简谐囚禁下通过短程相互作用的光谱。格林函数的方法是用来统一的二维和三维的情况下。我们得出的标准的普遍性的频谱,即其独立的细节的短程相互作用。在三维的结果为例窄s波费什巴赫共振,我们展示了如何有效的范围修正可以修改的水平结构的重排。然而,这需要非常窄的共振或非常紧密的陷阱,目前还没有实验可用。在二维的情况下,我们详细讨论了p-波通道,并演示了如何在格林函数的方法内出现的频谱的非普遍性。然后,我们表明,频谱是不是特别敏感的短距离的细节的情况下,两体相互作用有一个束缚态。

英文摘要:

We consider the spectrum of two ultracold harmonically trapped atoms interacting via short-range interactions. The Green's function approach is used to unify the two and three dimensional cases. We derive criteria for the universality of the spectrum, i.e. its independence of the details of the short-range interaction. The results in three dimensions are examplified for narrow s-wave Feshbach resonances and we show how effective range corrections can modify the rearrangement of the level structure. However, this requires extremely narrow resonances or very tight traps that are not currently experimentally available. In the two-dimensional case we discuss the p-wave channel in detail and demonstrate how the non-universality of the spectrum arises within the Green's function approach. We then show that the spectrum is not particularly sensitive to the short-distance details in the case when the two-body interaction has a bound state.

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