Electronic Structure of Chiral Collapsed Carbon Nanotubes and Characteristics of Flat Bands

Abstract

The study of characteristics of different sizes of flat bands were made. The study of chiral nanotubes were made and was found that the threshold diameter of free standing carbon nanotubes were of collapsed nature and were dependent on chirality and interlayer registry. In this process the symmetric breaking was also considered due to collapse. The registry was improved by interlayer shear. The study of electronic structure of collapsed cases were made and small band gap was found by means of confinement in flat band due to curved edges. But in the case of zigzag carbon nanotubes three small gap in semiconductor was produced and was dependent on width and band gaps. A monotonic feature gave rise to magic angle.