Feshbach resonances, weakly bound molecular states, and coupled-channel potentials for cesium at high magnetic fields
Feshbach resonances, weakly bound molecular states, and coupled-channel potentials for cesium at high magnetic fields
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DOI：
10.1103/physreva.87.032517
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发表时间：
2012-12
影响因子：
2.9
通讯作者：
M. Berninger;A. Zenesini;Bo Huang;Walter Harm;H. Nagerl;F. Ferlaino;R. Grimm;P. Julienne;J. Hutson
中科院分区：
文献类型：
--
作者：
M. Berninger;A. Zenesini;Bo Huang;Walter Harm;H. Nagerl;F. Ferlaino;R. Grimm;P. Julienne;J. Hutson
研究了超冷基态Cs原子在450 G（45 mT）~ 1000 G磁场下的散射特性。我们确定了17个以前未报道的Feshbach共振，包括两个非常广泛的549和787 G附近。我们用磁场调制光谱测量了几种不同的二聚体态的结合能。我们使用最小二乘拟合这些实验结果，与以前的测量在较低的字段，以确定一个六参数模型的长程相互作用势，指定M2012。使用M2012的耦合通道计算在所考虑的整个场范围内提供了s波散射长度和磁场之间的精确映射。这种映射对于依赖于精确调整散射长度的实验至关重要，例如Efimov物理学。
We explore the scattering properties of ultracold ground-state Cs atoms at magnetic fields between 450 G (45 mT) and 1000 G. We identify 17 previously unreported Feshbach resonances, including two very broad ones near 549 and 787 G. We measure the binding energies of several different dimer states by magnetic field modulation spectroscopy. We use least-squares fitting to these experimental results, together with previous measurements at lower field, to determine a six-parameter model of the long-range interaction potential, designated M2012. Coupled-channels calculations using M2012 provide an accurate mapping between the s-wave scattering length and the magnetic field over the entire range of fields considered. This mapping is crucial for experiments that rely on precise tuning of the scattering length, such as those on Efimov physics.