Alternative route to strong interaction: narrow Feshbach resonance.
Alternative route to strong interaction: narrow Feshbach resonance.
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DOI：
10.1103/physrevlett.108.250401
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发表时间：
2011-05
影响因子：
8.6
通讯作者：
T. Ho;Xiaoling Cui;Weiran Li
中科院分区：
文献类型：
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作者：
T. Ho;Xiaoling Cui;Weiran Li
我们发现，一个狭窄的共振产生强烈的相互作用的影响远远超出其宽度的一侧的共振，其中的束缚态尚未形成。这是由于其相移的共振结构，在束缚态出现之前，它将大量散射态的相位移动π。结果表明，当从共振的不同侧面接近“上”和“下”分支上的共振时，相互作用能的大小是高度不对称的，这与它们在宽共振中的对应物不同。这些影响的测量在实验上是可行的。
We show that a narrow resonance produces strong interaction effects far beyond its width on the side of the resonance where the bound state has not been formed. This is due to a resonance structure of its phase shift, which shifts the phase of a large number of scattering states by π before the bound state emerges. As a result, the magnitude of the interaction energy when approaching the resonance on the "upper" and "lower" branch from different side of the resonance is highly asymmetric, unlike their counterpart in wide resonances. Measurements of these effects are experimentally feasible.