Dynamical Generation of Topological Magnetic Lattices for Ultracold Atoms
Dynamical Generation of Topological Magnetic Lattices for Ultracold Atoms
复制标题
超冷原子拓扑磁晶格的动态生成
DOI：
10.1103/physrevlett.116.143003
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发表时间：
2016
影响因子：
8.6
通讯作者：
You Li
中科院分区：
文献类型：
--
作者：
Yu Jinlong;Xu Zhi-Fang;Lu Rong;You Li
提出了一种利用时间周期磁场脉冲动态合成中性原子空间周期有效磁场的方案。当原子自旋随有效磁场方向运动时，由于Berry相位效应，原子质心运动出现绝热标量势和几何矢量势。当原子在绝热势最小值形成的蜂窝晶格点之间跳跃时，矢量势诱导了跳跃系数中的复Peierls相位因子，这些相位因子促进了拓扑Chern绝缘体的形成.随着外部参数的进一步调整，可以实现拓扑相变和拓扑平坦带，突出了研究该系统中强关联现象的现实前景。我们的信提出了一种通过磁场创建和操纵超冷原子拓扑状态的替代途径。
We propose a scheme to dynamically synthesize a space-periodic effective magnetic field for neutral atoms by time-periodic magnetic field pulses. When atomic spin adiabatically follows the direction of the effective magnetic field, an adiabatic scalar potential together with a geometric vector potential emerges for the atomic center-of-mass motion, due to the Berry phase effect. While atoms hop between honeycomb lattice sites formed by the minima of the adiabatic potential, complex Peierls phase factors in the hopping coefficients are induced by the vector potential, and these phase factors facilitate a topological Chern insulator. With further tuning of external parameters, both a topological phase transition and topological flat bands can be achieved, highlighting realistic prospects for studying strongly correlated phenomena in this system. Our Letter presents an alternative pathway towards creating and manipulating topological states of ultracold atoms by magnetic fields.