Energy levels of double triangular graphene quantum dots
Energy levels of double triangular graphene quantum dots
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DOI：
10.1063/1.4896529
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发表时间：
2014-09
影响因子：
3.2
通讯作者：
F. Liang;Zhao-tan Jiang;Z. Lv;H. Zhang;Shuhua Li
中科院分区：
文献类型：
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作者：
F. Liang;Zhao-tan Jiang;Z. Lv;H. Zhang;Shuhua Li
基于紧束缚哈密顿模型，对耦合双三角形石墨烯量子点的能级结构进行了理论研究。包括ZZ型、ZA型和AA型GQD的双GQD，其中两个GQD具有Z字形或扶手椅型边界，可以通过不同的点间连接（例如直接偶联、苯环链和碳原子链）偶联在一起。结果表明，耦合的双量子点的能谱是相应的两个孤立的量子点的能谱的合并与由点间连接触发的修改。点间连接对能级简并有不同程度的提升作用，随着点间连接由直接耦合向长链耦合的转变，ZZ型和AA型双量子点中能级简并的消除受到抑制，表明两个耦合的量子点之间有退耦的趋势.然后我们考虑的光谱的影响...
We investigate theoretically the energy levels of the coupled double triangular graphene quantum dots (GQDs) based on the tight-binding Hamiltonian model. The double GQDs including the ZZ-type, ZA-type, and AA-type GQDs with the two GQDs having the zigzag or armchair boundaries can be coupled together via different interdot connections, such as the direct coupling, the chains of benzene rings, and those of carbon atoms. It is shown that the energy spectrum of the coupled double GQDs is the amalgamation of those spectra of the corresponding two isolated GQDs with the modification triggered by the interdot connections. The interdot connection is inclined to lift up the degeneracies of the energy levels in different degree, and as the connection changes from the direct coupling to the long chains, the removal of energy degeneracies is suppressed in ZZ-type and AA-type double GQDs, which indicates that the two coupled GQDs are inclined to become decoupled. Then we consider the influences on the spectra of the...