Laboratoire Kastler Brossel, ENS, UPMC, CNRS, 24 rue Lhomond, 75005 Paris, France.
Phys Rev Lett. 2010 Jul 9;105(2):020401. doi: 10.1103/PhysRevLett.105.020401. Epub 2010 Jul 6.
We perform Ramsey spectroscopy on the ground state of ultracold 87Rb atoms magnetically trapped on a chip in the Knudsen regime. Field inhomogeneities over the sample should limit the 1/e contrast decay time to about 3 s, while decay times of 58 ± 12 s are actually observed. We explain this surprising result by a spin self-rephasing mechanism induced by the identical spin rotation effect originating from particle indistinguishability. We propose a theory of this synchronization mechanism and obtain good agreement with the experimental observations. The effect is general and may appear in other physical systems.
我们在克鲁森 regime 下，对芯片上磁阱中的超冷 87Rb 原子基态进行拉姆齐光谱学实验。 由于样品中的磁场不均匀性，1/e 对比度衰减时间应该限制在约 3 s，但实际上观察到的衰减时间为 58 ± 12 s。 我们通过源自粒子不可分辨性的相同自旋旋转效应引起的自旋自相位恢复机制来解释这一令人惊讶的结果。 我们提出了这种同步机制的理论，并与实验观察结果吻合良好。 该效应是普遍的，可能会出现在其他物理系统中。
