发表机构
Universidad Técnica Federico Santa María; Pontificia Universidad Católica de Valparaíso（费德里科Santa玛丽亚技术大学; 瓦帕拉索天主教宗座大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过紧束缚模型和格林函数方法，研究了CSSH梯子的能谱、拓扑相及输运性质，识别出多个拓扑相并揭示平带与连续谱束缚态的形成条件，建立了拓扑、平带与输运间的直接联系。
AI 中文摘要
本文研究了Creutz-Su-Schrieffer-Heeger（CSSH）梯子的电子、拓扑和输运性质。利用格林函数形式下的紧束缚模型，我们计算了能谱、局域态密度（LDOS）和电子透射率。我们首先确定了CSSH梯子的能谱，并分析了系统中存在的不同拓扑相，识别出一个平凡相和三个不同的非平凡区域。然后我们研究了电子输运，并表明透射率通过特征输运信号重现了不同的拓扑相。最后，我们推导了非拓扑平带出现的条件，并证明这些平带也为连续谱中束缚态（BICs）的形成提供了必要条件。我们的结果在CSSH梯子的拓扑性质、平带形成和电子输运之间建立了直接联系。
英文摘要
In this work, we investigate the electronic, topological, and transport properties of a Creutz-Su-Schrieffer-Heeger (CSSH) ladder. Using a tight-binding model within the Green's function formalism, we calculate the energy spectrum, local density of states (LDOS), and electronic transmission. We first determine the energy spectrum of the CSSH ladder and analyze the different topological phases present in the system, identifying one trivial phase and three distinct nontrivial regions. We then study electronic transport and show that the transmission reproduces the different topological phases through characteristic transport signatures. Finally, we derive the conditions for the emergence of non-topological flat bands and demonstrate that these bands also provide the necessary conditions for the formation of bound states in the continuum (BICs). Our results establish a direct connection between the topological properties, flat-band formation, and electronic transport in the CSSH ladder.
Comments12 pages, 6 figures
