InAs(111)A 表面上工程量子点分子的拓扑边界态:奇数量子点

Van Dong Pham, Yi Pan, Steven C. Erwin, Felix von Oppen, Kiyoshi Kanisawa, Stefan Fölsch
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引用次数: 0

摘要

利用扫描隧道显微镜进行原子操作,在 InAs(111)A 表面构建量子点。每个点由六个电离铟原子组成。带正电荷的原子会对表面态电子产生约束电势,导致出现与点相关的束缚态。通过将这些点排成 N 个点链,并在它们之间交替进行隧道耦合,我们构建出了量子点分子,它揭示了一维拓扑相的苏-施里弗-希格(SSH)模型所预测的电子边界态。我们构建了奇数 N 的点链,使它们能够承载单一的端态或域壁态,从而可以通过扫描隧道光谱探测边界态在给定子晶格上的定位。我们发现禁用子晶格上也存在概率密度,同时链约束态的能谱也不对称。这种与 SSH 模型的偏差是由于点带电,并沿链产生了现场电势的变化--这并没有消除边界态,而是使它们的能量偏离了中隙位置。我们的研究结果表明,拓扑边界态可以在原子级精度的量子点阵列中产生。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Topological boundary states in engineered quantum-dot molecules on the InAs(111)A surface: Odd numbers of quantum dots

Topological boundary states in engineered quantum-dot molecules on the InAs(111)A surface: Odd numbers of quantum dots
Atom manipulation by scanning tunneling microscopy was used to construct quantum dots on the InAs(111)A surface. Each dot comprised six ionized indium adatoms. The positively charged adatoms create a confining potential acting on surface-state electrons, leading to the emergence of a bound state associated with the dot. By lining up the dots into N-dot chains with alternating tunnel coupling between them, quantum-dot molecules were constructed that revealed electronic boundary states as predicted by the Su-Schrieffer-Heeger (SSH) model of one-dimensional topological phases. Dot chains with odd N were constructed such that they host a single end or domain-wall state, allowing one to probe the localization of the boundary state on a given sublattice by scanning tunneling spectroscopy. We found probability density also on the forbidden sublattice together with an asymmetric energy spectrum of the chain-confined states. This deviation from the SSH model arises because the dots are charged and create a variation in on-site potential along the chain—which does not remove the boundary states but shifts their energy away from the midgap position. Our results demonstrate that topological boundary states can be created in quantum-dot arrays engineered with atomic-scale precision.
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CiteScore
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