Spectrum and dynamics of the BCS-BEC crossover from a few-body perspective.
Spectrum and dynamics of the BCS-BEC crossover from a few-body perspective.
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从少体角度看 BCS-BEC 交叉的频谱和动态。
DOI：
10.1103/physrevlett.99.090402
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发表时间：
2007
影响因子：
8.6
通讯作者：
C. Greene
中科院分区：
文献类型：
--
作者：
J. von Stecher;C. Greene
在BCS-BEC交叉的整个范围内，利用相关高斯基计算了阱中两个自旋向上和两个自旋向下的费米子的谱。这些精确的计算为交叉问题提供了一个少体解。利用该解模拟法诺-费什巴赫共振附近费米气体的实验，研究了系统随散射长度变化的时间演化。避免光谱交叉的结构使我们能够将系统的动力学理解为一系列朗道-齐纳跃迁。最后，我们提出了一个研究原子-分子相干性的斜坡方案。
The spectrum of two spin-up and two spin-down fermions in a trap is calculated using a correlated Gaussian basis throughout the range of the BCS-BEC crossover. These accurate calculations provide a few-body solution to the crossover problem. This solution is used to study the time evolution of the system as the scattering length is changed, mimicking experiments with Fermi gases near Fano-Feshbach resonances. The structure of avoiding crossings in the spectrum allow us to understand the dynamics of the system as a sequence of Landau-Zener transitions. Finally, we propose a ramping scheme to study atom-molecule coherence.