一种新的人工condensed matter晶格和一个新的一维拓扑相平台
A novel artificial condensed matter lattice and a new platform for one-dimensional topological phases
摘要：
凝聚态物理中的工程晶格，例如冷原子光晶格或光子晶体，可以具有与天然存在的电子晶体根本不同的性质。在这里，我们报告了一种新型的人工量子物质晶格。我们的晶格是由拓扑绝缘体和普通绝缘体的交替薄膜构成的多层异质结构。每个界面内的异质结构主机一组拓扑保护的界面状态，并通过使层足够薄，我们第一次展示了跨层的界面状态的杂交。通过这种方式，我们的异质结构形成了一个新兴的原子链，其中界面作为晶格位置和界面态作为原子轨道，从我们的角度分辨光电子能谱（ARPES）的测量中可以看出。通过改变异质结构的组成，我们可以直接控制晶格位置之间的跳跃。我们在超晶格能带结构中实现了拓扑相和平凡相。我们认为，超晶格的特点可能是在一个重要的方式由一维拓扑不变量，密切相关的苏-施里弗-Heeger模型的不变量。我们的拓扑绝缘体异质结构展示了一种新颖的实验平台，在该平台上，我们可以通过直接控制电子如何在晶格位置之间跳跃来设计能带结构。
英文摘要：
Engineered lattices in condensed matter physics, such as cold atom optical lattices or photonic crystals, can have fundamentally different properties from naturally-occurring electronic crystals. Here, we report a novel type of artificial quantum matter lattice. Our lattice is a multilayer heterostructure built from alternating thin films of topological and trivial insulators. Each interface within the heterostructure hosts a set of topologically-protected interface states, and by making the layers sufficiently thin, we demonstrate for the first time a hybridization of interface states across layers. In this way, our heterostructure forms an emergent atomic chain, where the interfaces act as lattice sites and the interface states act as atomic orbitals, as seen from our measurements by angle-resolved photoemission spectroscopy (ARPES). By changing the composition of the heterostructure, we can directly control hopping between lattice sites. We realize a topological and a trivial phase in our superlattice band structure. We argue that the superlattice may be characterized in a significant way by a one-dimensional topological invariant, closely related to the invariant of the Su-Schrieffer-Heeger model. Our topological insulator heterostructure demonstrates a novel experimental platform where we can engineer band structures by directly controlling how electrons hop between lattice sites.
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