Enhanced sensitivity to fundamental constants in ultracold atomic and molecular systems near Feshbach resonances.
Enhanced sensitivity to fundamental constants in ultracold atomic and molecular systems near Feshbach resonances.
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增强对费什巴赫共振附近超冷原子和分子系统中基本常数的敏感性。
DOI：
10.1103/physrevlett.96.230801
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发表时间：
2006
影响因子：
8.6
通讯作者：
V. Flambaum
中科院分区：
文献类型：
--
作者：
C. Chin;V. Flambaum
散射长度可以在玻色-爱因斯坦凝聚和费什巴赫分子实验中测量，它对基本常数的变化非常敏感，特别是电子与质子的质量比(m(E)/m(P)或m(E)/Lambda(Qcd)，其中Lambda(Qcd)是QCD标度)。基于单通道和双通道散射模型，我们给出了质量比随散射长度的变化规律。我们的结果表明，通过监测1%水平上的散射长度，可以在窄磁或光学Feshbach共振附近探测到m(E)/m(P)在10(-11)-10(-14)水平上的变化。推导出的公式也可以用来估计散射长度的同位素位移。
Scattering length, which can be measured in Bose-Einstein condensate and Feshbach molecule experiments, is extremely sensitive to the variation of fundamental constants, in particular, the electron-to-proton mass ratio (m(e)/m(p) or m(e)/Lambda(QCD), where Lambda(QCD), is the QCD scale). Based on single- and two-channel scattering models, we show how the variation of the mass ratio propagates to the scattering length. Our results suggest that variation of m(e)/m(p) on the level of 10(-11) - 10(-14) on the level of can be detected near a narrow magnetic or an optical Feshbach resonance by monitoring the scattering length on the 1% level. Derived formulas may also be used to estimate the isotopic shift of the scattering length.