光学超晶格中强相互作用玻色子的拓扑磁振子绝缘体和量子泵
Topological magnon insulator and quantized pumps from strongly-interacting bosons in optical superlattices
摘要：
基于光学超晶格中强相互作用的双组分超冷原子，提出了一种实现拓扑绝缘体和磁振子激发量子化泵浦的方案。具体来说，我们将展示如何工程的苏-Schrieffer-Heeger模型的磁振子使用状态无关的超晶格，和赖斯-梅勒模型使用状态相关的超晶格。我们描述了现实的实验协议来检测这两个模型中的磁振子激发的拓扑签名。特别是，我们表明，一个单一的磁振子的非平衡动力学可以利用直接检测拓扑绕组数和相变。我们还描述了如何拓扑（量子化）泵可以实现与磁振子，并研究这种现象如何依赖于初始磁振子状态的准备。我们的研究为探索物质的磁振子拓扑相及其在拓扑磁振子输运背景下的潜在应用开辟了新的途径。
英文摘要：
We propose a scheme realizing topological insulators and quantized pumps for magnon excitations, based on strongly-interacting two-component ultracold atoms trapped in optical superlattices. Specifically, we show how to engineer the Su-Schrieffer-Heeger model for magnons using state-independent superlattices, and the Rice-Mele model using state-dependent superlattices. We describe realistic experimental protocols to detect the topological signatures of magnon excitations in these two models. In particular, we show that the non-equilibrium dynamics of a single magnon can be exploited to directly detect topological winding numbers and phase transitions. We also describe how topological (quantized) pumps can be realized with magnons, and study how this phenomenon depends on the initial magnon state preparation. Our study opens a new avenue for exploring magnonic topological phases of matter and their potential applications in the context of topological magnon transport.
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