Feshbach spectroscopy of Cs atom pairs in optical tweezers
Feshbach spectroscopy of Cs atom pairs in optical tweezers
复制标题
光镊中铯原子对的费什巴赫光谱
DOI：
10.1088/1367-2630/ac99f6
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发表时间：
2022
影响因子：
3.3
通讯作者：
Brooks R
中科院分区：
文献类型：
--
作者：
Brooks R
在单光镊中制备了133Cs原子对，并对原子在（f= 3，mf =±3）态的碰撞进行了Feshbach光谱研究。我们检测增强对损耗使用的光镊重复细分的检测方案。对于处于（3，− 3）态的原子，我们通过非弹性损耗谱来识别共振特征。我们进行耦合通道散射计算，并表明，在典型的实验温度下的损失功能大多集中在零的散射长度，而不是共振中心。我们测量碰撞后剩余的原子数，阐明不同的损失过程是如何受到镊子深度的影响。这些测量探测非弹性碰撞过程中释放的能量，从而提供碰撞产物状态的信息。我们还确定与原子对在绝对基态（f= 3，M f= 3），其中两体辐射损失是由一个激发激光蓝失谐的Cs D 2线工程准备的共振。这些结果表明，光镊是一个多功能的工具，研究两体碰撞与数分辨检测灵敏度。
We prepare pairs of 133 Cs atoms in a single optical tweezer and perform Feshbach spectroscopy for collisions of atoms in the states (f= 3, m f=±3). We detect enhancements in pair loss using a detection scheme where the optical tweezers are repeatedly subdivided. For atoms in the state (3,− 3), we identify resonant features by performing inelastic loss spectroscopy. We carry out coupled-channel scattering calculations and show that at typical experimental temperatures the loss features are mostly centred on zeroes in the scattering length, rather than resonance centres. We measure the number of atoms remaining after a collision, elucidating how the different loss processes are influenced by the tweezer depth. These measurements probe the energy released during an inelastic collision, and thus give information on the states of the collision products. We also identify resonances with atom pairs prepared in the absolute ground state (f= 3, m f= 3), where two-body radiative loss is engineered by an excitation laser blue-detuned from the Cs D 2 line. These results demonstrate optical tweezers to be a versatile tool to study two-body collisions with number-resolved detection sensitivity.