顺磁绝缘体中电子电偶极矩的新实验极限
New Experimental Limit on the Electric Dipole Moment of the Electron in a Paramagnetic Insulator
摘要：
我们报告的结果的实验搜索的固有电偶极矩（EDM）的电子使用固态技术。该实验采用了一种顺磁性的绝缘钆镓石榴石（GGG），在低温下具有很大的磁响应。eEDM的存在将导致小但非零的磁化，因为GGG样品经受强电场。我们用灵敏的磁力计寻找斯塔克诱导的磁化强度。最近在抑制几种背景来源方面取得的进展使实验在统计不确定性水平上不受虚假信号的影响。我们报告了我们的第一个eEDM限值，即$(-5.57 \pm 7.98 \pm 0.12)\times$ 10 $^{-25}$ e $\cdot$ cm，5天的数据平均值。
英文摘要：
We report results of an experimental search for the intrinsic Electric Dipole Moment (EDM) of the electron using a solid-state technique. The experiment employs a paramagnetic, insulating gadolinium gallium garnet (GGG) that has a large magnetic response at low temperatures. The presence of the eEDM would lead to a small but non-zero magnetization as the GGG sample is subject to a strong electric field. We search for the resulting Stark-induced magnetization with a sensitive magnetometer. Recent progress on the suppression of several sources of background allows the experiment to run free of spurious signals at the level of the statistical uncertainties. We report our first limit on the eEDM of $(-5.57 \pm 7.98 \pm 0.12)\times$10$^{-25}$e$\cdot$cm with 5 days of data averaging.
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