论文标题
定期驾驶在动量空间中具有超速原子的螺旋浮标通道
Periodic driving induced helical Floquet channels with ultracold atoms in momentum space
论文作者
论文摘要
作为合成尺寸的外部原子自由度，可以轻松及其量子工程和量子模拟的新访问。作为最近的发展，患有两光子布拉格过渡的超速原子可以衍射成一系列离散的动量状态，形成动量晶格。在这里，我们通过引入周期性驾驶序列，对这种系统提供了有关此类系统的详细分析，并作为具体的示例报告了强大的螺旋浮球通道的观察。这些通道对扰动的鲁棒性得到了证实，作为对浮雕绕组数字捕获的拓扑起源的测试。此处展示的定期切换是针对更复杂的浮点辅助方案的测试床，并为在多体环境中具有可调互动的多体设置提供了令人兴奋的机会来研究新颖的拓扑物理学。
Employing the external degrees of freedom of atoms as synthetic dimensions renders easy and new accesses to quantum engineering and quantum simulation. As a recent development, ultracold atoms suffering from two-photon Bragg transitions can be diffracted into a series of discrete momentum states to form a momentum lattice. Here we provide a detailed analysis on such a system, and, as a concrete example, report the observation of robust helical Floquet channels, by introducing periodic driving sequences. The robustness of these channels against perturbations is confirmed, as a test for their topological origin captured by Floquet winding numbers. The periodic switching demonstrated here serves as a testbed for more complicated Floquet engieering schemes, and offers exciting opportunities to study novel topological physics in a many-body setting with tunable interactions.
