近日，美国威廉与玛丽学院的S. Aubin及其研究团队取得一项新进展。他们对超冷原子的射频交流塞曼力进行了研究。相关研究成果已于2024年12月23日在国际知名学术期刊《物理评论A》上发表。

该研究团队测量了由于近8兆赫兹的射频（RF）场驱动内流形塞曼跃迁，而对超冷原子产生的交流塞曼力。在来自原子芯片的原子上，研究人员观察到了射频功率为毫瓦级时产生的力，约为重力的2.5倍。这项测量结果与理论预测相符，并证实该力的自旋态依赖性，以及其共振和双极性行为。

研究人员通过初始失谐来确定，哪些自旋是交流塞曼高场寻求者和低场寻求者，从而利用这一特性在空间上分离了自旋混合物，证实了交流斯特恩-盖拉赫效应。考虑到未来可能将该力用于原子囚禁，研究人员观察了作为失谐和功率函数的，修饰态自旋混合的时间依赖性。

附：英文原文

Title: Radio-frequency ac Zeeman force for ultracold atoms

Author: A. P. Rotunno, W. Miyahira, S. Du, and S. Aubin*,†

Issue&Volume: 2024-12-23

Abstract: We measure the ac Zeeman force acting on ultracold atoms due to a radio frequency (rf) field driving intramanifold Zeeman transitions near 8 MHz. We observe about 2.5 times the force of gravity for mW of rf power acting on atoms from the atom chip. Our measurements are consistent with theoretical predictions and demonstrate the spin-state dependence of the force, as well as its resonant and bipolar behavior. We demonstrate the ac Stern-Gerlach effect by spatially separating a spin mixture, using initial detuning to determine which spins are ac Zeeman high- and low-field seekers. With an eye towards using this force for atom trapping, we observe the time dependence of dressed state spin mixing as a function of detuning and power.

DOI: 10.1103/PhysRevA.110.063321

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.063321