Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems.
Floquet Symmetry-Protected Topological Phases in Cold-Atom Systems.
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DOI：
10.1103/physrevlett.119.123601
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发表时间：
2016-10
影响因子：
8.6
通讯作者：
Ionut-Dragos Potirniche;A. Potter;M. Schleier-Smith;A. Vishwanath;N. Yao
中科院分区：
文献类型：
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作者：
Ionut-Dragos Potirniche;A. Potter;M. Schleier-Smith;A. Vishwanath;N. Yao
我们提出并分析了通过周期性驱动实现相互作用对称保护拓扑相位的两种不同途径。首先，我们证明了驱动的横场Ising模型可以用于设计复杂的相互作用，从而能够模拟平衡的SPT阶段。该相位仅在由驱动频率控制的参数时间尺度内保持稳定，超过该时间尺度，其拓扑特征就会分解。为了克服这个问题，我们考虑了一种基于实现本质Floquet SPT相位的替代路线，该相位没有任何平衡模拟。在这两种情况下，我们都表明，导致多体局域化的无序可以防止失控的加热，并使在高能量密度下观察相干量子动力学成为可能。此外，我们通过识别后者独特的基于微运动的纠缠谱特征来澄清平衡相和Floquet SPT相之间的区别。最后，我们提出了在一维里德堡原子链中的统一实现，并证明了在现实的实验时间尺度上可以观察到保护边缘模式。
We propose and analyze two distinct routes toward realizing interacting symmetry-protected topological (SPT) phases via periodic driving. First, we demonstrate that a driven transverse-field Ising model can be used to engineer complex interactions which enable the emulation of an equilibrium SPT phase. This phase remains stable only within a parametric time scale controlled by the driving frequency, beyond which its topological features break down. To overcome this issue, we consider an alternate route based upon realizing an intrinsically Floquet SPT phase that does not have any equilibrium analog. In both cases, we show that disorder, leading to many-body localization, prevents runaway heating and enables the observation of coherent quantum dynamics at high energy densities. Furthermore, we clarify the distinction between the equilibrium and Floquet SPT phases by identifying a unique micromotion-based entanglement spectrum signature of the latter. Finally, we propose a unifying implementation in a one-dimensional chain of Rydberg-dressed atoms and show that protected edge modes are observable on realistic experimental time scales.