标题： 冷原子中光介导自旋结构的磁相图 显示英文标题

标题： Magnetic Phase Diagram of Light-mediated Spin Structuring in Cold Atoms

摘要： 当将红频偏置的后向反射激光束应用于大量冷原子云时，我们观察到在横向平面中自发形成二维结构，这些结构对应于光场和原子自旋的高对比度空间调制。 通过施加弱磁场，我们探索了由此产生的丰富相空间，并确定了与原子磁矩的偶极项和四极项相关的特定相。 特别是我们展示了由光学诱导的基态相干性所产生的自发结构，这些结构代表磁四极子。 显示英文摘要

摘要： When applying a red-detuned retro-reflected laser beam to a large cloud of cold atoms, we observe the spontaneous formation of 2D structures in the transverse plane corresponding to high contrast spatial modulations of both light field and atomic spins. By applying a weak magnetic field, we explore the rich resulting phase space and identify specific phases associated with both dipolar and quadrupolar terms of the atomic magnetic moment. In particular we demonstrate spontaneous structures in optically induced ground state coherences representing magnetic quadrupoles.