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arXiv 0904.3477cond-mat.quant-gas
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一维势阱中三个费米子的Feshbach共振散射

Feshbach resonant scattering of three fermions in one-dimensional wells

T. Duric, A. F. Ho, D . K. K. Lee

摘要:

本文研究了在接近s波费什巴赫共振的一维光晶格中40K冷原子系统的弱隧穿极限。我们在一个双通道模型中计算了三个原子在晶格的一个位置上的局域谱。我们的结果表明,对于这个一维系统,单通道和双通道模型将不同接近费什巴赫共振,虽然这两个理论将收敛在强Feshbach耦合的限制。我们还发现了三原子单阱的低能谱中的能级交叉,这可能导致多阱光晶格的量子相变。我们讨论了系统对非均匀密度相的稳定性。

英文摘要:

We study the weak-tunnelling limit for a system of cold 40K atoms trapped in a one-dimensional optical lattice close to an s-wave Feshbach resonance. We calculate the local spectrum for three atoms at one site of the lattice within a two-channel model. Our results indicate that, for this one-dimensional system, one- and two-channel models will differ close to the Feshbach resonance, although the two theories would converge in the limit of strong Feshbach coupling. We also find level crossings in the low-energy spectrum of a single well with three atoms that may lead to quantum phase transition for an optical lattice of many wells. We discuss the stability of the system to a phase with non-uniform density.

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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