Electronic Correlation Effects on the Optical Properties of SiC,BeO and Boron Nitride Nanotubes and

• 作 者: H.Rezania Z.Aghaii Manesh
• 机 构: Department of Physics,Razi University,
• 出 处: Communications in Theoretical Physics
• 发表日期: 2015年11期
• 关键词: nanotubes Hubbard Correlation divergence sheets zigzag walled normalized nanotub

We present numerical calculation of the impact of electron-electron interaction on the behavior of density of states and optical properties of BeO,SiC and Boron-Nitride nanotubes and sheets.Hubbard model hamiltonian is applied to describe the dynamics of electrons on the lattice structure of theses compounds.The excitation spectrum of the system in the presence of local electronic interactions has been found using mean Seld approach.We find the band gap width in both optical absorption and density of states reduces with local Hubbard electronic interaction parameter.The absorption spectra exhibits the remarkable peaks,mainly owing to the divergence behavior of density of states and excitonic effects.Also we compare optical absorption frequency behavior of BeO,SiC and Boron-Nitride nanotubes with each other.Furthermore we investigate the optical properties of BeO and SiC sheets.A novel feature of optical conductivity of these structures is the decrease of frequency gap in the optical spectrum due to electronic interaction.

We present numerical calculation of the impact of electron-electron interaction on the behavior of density of states and optical properties of BeO, SiC and Boron-Nitride nanotubes and sheets. Hubbard model hamiltonian is applied to describe the dynamics of electrons on the lattice structure of theses compounds. the excitation spectrum of the system in the presence of local electronic interactions has been found using mean Seld approach. We find the band gap width in both optical absorption and density of states reduces with local Hubbard electronic interaction parameter. the remarkable peaks, mainly due to the divergence behavior of density of states and excitonic effects. Also we compare optical absorption frequency behavior of BeO, SiC and Boron-Nitride nanotubes with each other. Furthermore we investigate the optical properties of BeO and SiC sheets. A novel feature of optical conductivity of these structures is the decrease of frequency gap in the optical sp ectrum due to electronic interaction.