论文标题
使用官能化的悬臂力传感器在微米尺度上搜索异国旋转旋转相互作用的建议
Proposal for the search for exotic spin-spin interactions at the micrometer scale using functionalized cantilever force sensors
论文作者
论文摘要
可以通过交换假设的玻色子来产生自旋依赖性的外来相互作用,这些玻色子被引入以解决物理中的一些难题。已经进行了许多精确的实验来搜索此类相互作用,但没有进行确认的观察。在这里,我们提出了新的实验,以搜索可以通过轴或z $^\ prime $ boson介导的异国旋转旋转相互作用。敏感的功能化的悬臂被用作力传感器,以测量周期性磁源结构中自旋极化电子之间的相互作用和集成在悬臂上的闭环磁性结构。在数据采集期间,该来源设置为振荡,以调节外来力信号,以使振荡频率的高谐波调节。这有助于以信号频率抑制虚假信号。不同的磁性源结构设计用于不同的相互作用检测。磁条结构是为Z $^\ prime $介导的相互作用而设计的,该相互作用对轴突介导的相互作用的检测不敏感。如果我们假设两者都存在,这使我们能够测量两者的耦合常数。通过在低温下实现的力敏感性,预计拟议的实验将搜索耦合常数要小得多的参数空间,而不是当前从微米到毫米范围的严格约束。具体而言,参数空间的下限将比z $^\ prime $介导的相互作用的严格约束低七个数量级,而在$ 10 \,μ$ m的交互作用范围内,轴介导相互作用的数量级低。
Spin-dependent exotic interactions can be generated by exchanging hypothetical bosons, which were introduced to solve some puzzles in physics. Many precision experiments have been performed to search for such interactions, but no confirmed observation has been made. Here, we propose new experiments to search for the exotic spin-spin interactions that can be mediated by axions or Z$^\prime$ bosons. A sensitive functionalized cantilever is utilized as a force sensor to measure the interactions between the spin-polarized electrons in a periodic magnetic source structure and a closed-loop magnetic structure integrated on the cantilever. The source is set to oscillate during data acquisition to modulate the exotic force signal to high harmonics of the oscillating frequency. This helps to suppress the spurious signals at the signal frequency. Different magnetic source structures are designed for different interaction detections. A magnetic stripe structure is designed for Z$^\prime$-mediated interaction, which is insensitive to the detection of axion-mediated interaction. This allows us to measure the coupling constant of both if we assume both exist. With the force sensitivity achievable at low temperature, the proposed experiments are expected to search for the parameter spaces with much smaller coupling constant than the current stringent constraints from micrometer to millimeter range. Specifically, the lower bound of the parameter space will be seven orders of magnitude lower than the stringent constraints for Z$^\prime$-mediated interaction, and an order of magnitude lower for axion-mediated interaction, at the interaction range of $10\, μ$m.