Realizations of Su-Schrieffer-Heeger (SSH) edge states in two-dimensional hydrocarbon systems

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2024-08-30 DOI:10.1016/j.ssc.2024.115673

Yuxuan Song , Xibin Liu , Meng Zhou , Lixiu Guan , Xiaobiao Liu , Linyang Li

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Abstract

The Su-Schrieﬀer-Heeger (SSH) model of one-dimensional (1D) diatomic and four-atom chains, exhibit a topological phase transition characterized by the Zak phase. However, a challenge arises from the inherent difficulty of maintaining strong structural stability in real 1D nanostructures. Here, we show how to realize periodic 1D chains, reminiscent of the SSH model, in a two-dimensional (2D) system. These chains form a quasi-1D chain topological insulator (CTI) where the interchain coupling can be neglected. Based on first-principles calculations, we proposed that such CTIs can be realized in dumbbell (DB) C₄₀H₁₄ and DB C₄₀H₁₂ monolayers. The monolayers are CTIs, with a type of weak topological state, and the topological phase transition can be achieved by unit cell transformation or the application of 2D strain. Furthermore, increasing the number of DB C₁₀H₄ rings can enlarge the distance between the chains, corresponding to line defects within the monolayer, providing a possible strategy for experimental synthesis.

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在二维碳氢化合物体系中实现苏-施里弗-希格（SSH）边缘状态

一维（1D）二原子链和四原子链的苏-施莱尔-希格（SSH）模型表现出以扎克相为特征的拓扑相变。然而，在真实的一维纳米结构中保持较强的结构稳定性存在固有的困难，这给我们带来了挑战。在这里，我们展示了如何在二维（2D）系统中实现周期性 1D 链，让人联想到 SSH 模型。这些链形成了准一维链拓扑绝缘体（CTI），其中链间耦合可以忽略不计。基于第一原理计算，我们提出这种 CTI 可以在哑铃型 (DB) C40H14 和 DB C40H12 单层中实现。这些单层是具有弱拓扑状态的 CTI，拓扑相变可通过单胞转换或施加二维应变来实现。此外，增加 DB C10H4 环的数量可以扩大链之间的距离，从而在单层中产生相应的线缺陷，这为实验合成提供了一种可能的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.