Higbie J M, Sadler L E, Inouye S, Chikkatur A P, Leslie S R, Moore K L, Savalli V, Stamper-Kurn D M
Department of Physics, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2005 Jul 29;95(5):050401. doi: 10.1103/PhysRevLett.95.050401. Epub 2005 Jul 26.
Polarization-dependent phase-contrast imaging is used to resolve the spatial magnetization profile of an optically trapped ultracold gas. This probe is applied to Larmor precession of degenerate and nondegenerate spin-1 87Rb gases. Transverse magnetization of the Bose-Einstein condensate persists for the condensate lifetime, with a spatial response to magnetic field inhomogeneities consistent with a mean-field model of interactions. In comparison, the magnetization of the non-condensed gas decoheres rapidly. Rotational symmetry implies that the Larmor frequency of a spinor condensate be density independent, and thus suitable for precise magnetometry with high spatial resolution.
偏振相关相衬成像用于解析光阱中超冷气体的空间磁化分布。该探针应用于简并和非简并自旋 - 1 87Rb气体的拉莫尔进动。玻色 - 爱因斯坦凝聚体的横向磁化在凝聚体寿命内持续存在，其对磁场不均匀性的空间响应与相互作用的平均场模型一致。相比之下，非凝聚气体的磁化迅速退相干。旋转对称性意味着自旋凝聚体的拉莫尔频率与密度无关，因此适用于具有高空间分辨率的精确磁力测量。
