基于 SSH 模型的锯齿型边石墨烯纳米带电子能谱研究磁

摘要

利用SSH（ Su-Schrieffer-Heeger）模型研究了2条聚乙炔链键与键平行和非平行结构耦合的电子能谱。两者的电子能谱与耦合强度之间有类似关系，但平行结构受耦合强度的影响更大些。在此基础上，将耦合链模型应用于锯齿型石墨烯纳米带的电子能谱计算，并给出了解析色散关系。同时，还研究了电子能谱与其耦合强度的关系，耦合越强，能带越宽。%The electronic spectrum of two coupled polyacetylene chains with bond-bond parallel and non-paral-lel was studied by using the SSH ( Su-Schrieffer-Heeger) model.Both the spectra were related to the coupling intensity, but the effect of the bond-bond parallel structure on the spectrum was obvious compared to the non-parallel .Based on this model, the electronic spectrum of graphene nanoribbons with zigzag edges was calculat-ed and the energy dispersion relation was derived.The relationship between the spectrum and the coupling in-tensity was also discussed, which showed that the stronger the coupling was the wider the energy band ap-peared.