基于SSH模型的锯齿型边石墨烯纳米带电子能谱研究

The electronic spectrum of graphene nanoribbons with zigzag edges based on the SSH model

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-parallel 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 nonparallel. Based on this model,the electronic spectrum of graphene nanoribbons with zigzag edges was calculated and the energy dispersion relation was derived. The relationship between the spectrum and the coupling intensity was also discussed,which showed that the stronger the coupling was the wider the energy band appeared.