Periodicity of band gaps of chiral α-graphyne nanotubes
Literature Information
Baotao Kang, Daeheum Cho, Jin Yong Lee
Electronic structures of zigzag (n,0), armchair (n,n), and chiral (n,m) α-graphyne nanotubes (αGNTs) with n = 2–7 were investigated using density functional tight binding calculations. Oscillatory behavior of the band gaps with a period of every (n − m) = 3 was found for each tube. According to the periodicity, αGNTs could be classified into three families, and their band gaps were in the increasing order of (n − m) = 3a < 3a + 1 < 3a + 2. Among the three families, αGNTs with (n − m) = 3a became effectively semimetallic when the tube size was larger than approximately 2 nm, while the other families remained semiconducting.
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