用分子标尺寻找纳米尺度下电子间自旋相关的奇异相互作用
Searching for an Exotic Spin-Dependent Interaction between Electrons at the Nanometer Scale with Molecular Rulers
摘要：
我们提出了一种分子标尺，它包含两个电子自旋与精确可调的距离，通过改变形状持久的聚合物链的长度，可以用来限制轴矢量介导的电子自旋之间的相互作用在纳米尺度上。通过测量不同分子尺度下两个电子自旋之间的耦合强度，在3 ~ 220 nm的力范围内建立了一个改进的电子间奇异偶极-偶极相互作用的实验室边界。在200 nm处耦合$g_A^e g_A^e/4π\hbar c $的上限为$|g_A^e g_A^e/4π\hbar c| \leq 4.9\times10^{-13}$，其比先前的限制严格约20倍。
英文摘要：
We propose that a type of molecular rulers, which contains two electron spins with precisely adjustable distance by varying the length of the shape-persistent polymer chains, can be utilized to constrain the axial-vector mediated interaction between electron spins at the nanometer scale. With measurements of the coupling strengths between two electron spins within different molecular rulers, an improved laboratory bound of exotic dipole-dipole interaction between electrons is established within the force range from 3 to 220 nm. The upper bound of the coupling $g_A^e g_A^e/4π\hbar c $ at 200 nm is $|g_A^e g_A^e/4π\hbar c| \leq 4.9\times10^{-13}$, which is about 20 times more stringent than previous limits.
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