Ultracold atoms have become one of the most exciting platforms to synthesize novel condensed matter physics. Here we realize a sawtooth superradiance lattice in Bose–Einstein condensates and investigate its chiral edge currents. Based on one-dimensional superradiance lattice (SL) in standing wave-coupled electromagnetically induced transparency, a far-detuned standing-wave field is introduced to synthesize a magnetic field. The relative spatial phase between the two standing-wave coupling fields introduce a magnetic flux in the sawtooth loop transitions of the lattice. This flux determines the moving direction of excitations created in the SL and results in nonsymmetric reflectivities when the SL is probed in two opposite directions. Our work demonstrates an in situ technique to synthesize and detect artificial gauge field in cold atoms.

超冷原子已成为合成新型凝聚态物理的最令人兴奋的平台之一。在这里，我们在Bose-Einstein凝聚物中实现了锯齿形超辐射晶格，并研究了其手性边缘电流。基于驻波耦合电磁感应透明中的一维超辐射晶格（SL），引入了远失谐的驻波场来合成磁场。两个驻波耦合场之间的相对空间相位在晶格的锯齿形环过渡中引入了磁通量。当在两个相反方向探测SL时，该通量决定了SL中产生的激发的移动方向，并导致非对称反射率。我们的工作演示了一种原位技术，用于合成和检测冷原子中的人工规范场。