费什巴赫增强的费米子波散射：通过优化吸收成像的直接观测
Feshbach enhanced -wave scattering of fermions: direct observation with optimized absorption imaging.
作者信息
Genkina D, Aycock L M, Stuhl B K, Lu H-I, Williams R A, Spielman I B
机构信息
Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland, Gaithersburg, MD, 20899 USA.
Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland, Gaithersburg, MD, 20899 USA; Physics Department, Cornell University, Ithaca, NY 14850 USA.
出版信息
New J Phys. 2016 Jan;18. doi: 10.1088/1367-2630/18/1/013001. Epub 2015 Dec 17.
We directly measured the normalized -wave scattering cross-section of ultracold K atoms across a magnetic-field Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. We extracted the scattered fraction for a range of bias magnetic fields, and measured the resonance location to be = 20.206(15) mT with width Δ = 1.0(5) mT. To optimize the signal-to-noise ratio of atom number in scattering images, we developed techniques to interpret absorption images in a regime where recoil induced detuning corrections are significant. These imaging techniques are generally applicable to experiments with lighter alkalis that would benefit from maximizing signal-to-noise ratio on atom number counting at the expense of spatial imaging resolution.
我们通过使简并费米气体（DFGs）对碰撞并对散射原子进行成像，直接测量了超冷钾原子在磁场费什巴赫共振中的归一化波散射截面。我们提取了一系列偏置磁场下的散射分数，并测得共振位置为 = 20.206(15) mT，宽度Δ = 1.0(5) mT。为了优化散射图像中原子数的信噪比，我们开发了一些技术，用于在反冲诱导失谐校正显著的情况下解释吸收图像。这些成像技术通常适用于使用较轻碱金属的实验，这类实验通过牺牲空间成像分辨率来最大化原子数计数的信噪比而受益。
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