AI 中文总结
该研究基于³He核构建核自旋振荡器来寻找奇异自旋耦合，通过特定气室极化、自旋交换碰撞等操作，利用法拉第旋转监测核自旋拉莫尔进动，实现自持振荡，其对奇异自旋耦合的灵敏度比现有碱金属原子磁强计高约5倍。
AI 中文摘要
我们描述了一项基于³He核的核自旋振荡器的实验研究，它作为一种可能的探测器来寻找奇异自旋耦合。一个由碱金属原子混合物（95%钾和5%铷）和³He气体组成的磁屏蔽气室，在直流磁场存在下，通过与铷中D1跃迁共振的激光进行极化。钾原子和³He核通过与极化铷原子的自旋交换碰撞而极化。核自旋通过垂直于直流磁场施加的磁场倾斜。通过与钾中D1跃迁共振的激光的法拉第旋转监测³He核自旋产生的拉莫尔进动。法拉第旋转信号经过滤波、放大，并用于在垂直于直流磁场的方向施加磁场，导致核自旋以与直流磁场成正比的频率进行自持振荡。我们展示了对奇异自旋耦合的灵敏度，比用于全球光学磁强计网络寻找奇异物理合作的碱金属原子磁强计高约5倍。
英文摘要
We describe an experimental investigation of a nuclear spin oscillator based on $^3$He nuclei as a possible detector to search for exotic spin couplings. A magnetically shielded vapor cell comprised of an alkali atom mixture ($95\%$ potassium and $5\%$ rubidium) and $^3$He gas is polarized via laser light resonant with the $D_1$ transition in rubidium in the presence of a dc magnetic field. The potassium atoms and $^3$He nuclei are polarized via spin-exchange collisions with the polarized rubidium atoms. The nuclear spins are tipped with a magnetic field applied perpendicular to the dc magnetic field. The resulting Larmor precession of the $^3$He nuclear spins is monitored via Faraday rotation of laser light near resonant with the $D_1$ transition in potassium. The Faraday rotation signal is filtered, amplified, and used to apply a magnetic field in a direction perpendicular to the dc magnetic field, resulting in a self-sustained oscillation of the nuclear spins at a frequency that is directly proportional to the dc magnetic field. We demonstrate a sensitivity to exotic spin couplings that is $\approx 5$ times higher than the alkali atom magnetometers that have been used in the Global Network of Optical Magnetometers to Search for Exotic Physics collaboration.
Comments10 pages, 4 figures
