ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, E-08860 Castelldefels (Barcelona), Spain.
Institute of Theoretical Physics and Astronomy, Vilnius University, A. Goštauto 12, Vilnius 01108, Lithuania.
Phys Rev Lett. 2014 Jan 31;112(4):043001. doi: 10.1103/PhysRevLett.112.043001. Epub 2014 Jan 28.
We describe a simple technique for generating a cold-atom lattice pierced by a uniform magnetic field. Our method is to extend a one-dimensional optical lattice into the "dimension" provided by the internal atomic degrees of freedom, yielding a synthetic two-dimensional lattice. Suitable laser coupling between these internal states leads to a uniform magnetic flux within the two-dimensional lattice. We show that this setup reproduces the main features of magnetic lattice systems, such as the fractal Hofstadter-butterfly spectrum and the chiral edge states of the associated Chern insulating phases.
我们描述了一种生成被均匀磁场穿透的冷原子晶格的简单技术。我们的方法是将一维光晶格扩展到内部原子自由度提供的“维度”，从而产生合成的二维晶格。这些内部状态之间适当的激光耦合导致二维晶格内的均匀磁通量。我们表明，这种设置再现了磁晶格系统的主要特征，例如分形 Hofstadter 蝴蝶谱和相关 Chern 绝缘相的手性边缘态。
