不同自旋取向原子自由降落普适性的检验
Test of the universality of free fall with atoms in different spin Orientations
摘要：
通过比较$m_F=-1$和$m_F=+1$中$^{87}$ Rb原子的重力加速度，我们对与自旋-重力耦合效应有关的自由降落（UFF）的普适性进行了检验.利用Mach-Zehnder型原子干涉仪测量了这两个子能级原子的自由降落加速度，得到了EPDMATHABMP与$\rm{\ddot{o}}$ s的比值为${η_S} =(-0.2\pm1.5)\times 10^{-5}$ .使用$m_F=+1$或$m_F=-1$中的原子的干涉仪对磁场不均匀性高度敏感，这限制了我们的UFF测试的当前实验精度。本文的工作为今后在原子基础上进行更高精度的不同自旋取向的UFF测试奠定了基础。
英文摘要：
We report a test of the universality of free fall (UFF) related to spin-gravity coupling effects by comparing the gravity acceleration of the $^{87}$Rb atoms in $m_F=+1$ versus that in $m_F=-1$, where the corresponding spin orientations are opposite. A Mach-Zehnder-type atom interferometer is exploited to sequentially measure the free fall acceleration of the atoms in these two sublevels, and the resultant E$\rm{\ddot{o}}$tv$\rm{\ddot{o}}$s ratio determined by this work is ${η_S} =(-0.2\pm1.5)\times 10^{-5}$. The interferometer using atoms in $m_F=+1$ or $m_F=-1$ is highly sensitive to magnetic field inhomogeneity, which limits the current experimental precision of our UFF test. The work here provides a stepping stone for future higher precision UFF test related to different spin orientations on atomic basis.
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