The effect of local electronic interaction on the optical properties of boron–nitride nanotubes

Author-Highlights
• Theoretical calculation of optical conductivity of boron nitride nanotubes in the context of Hubbard model.
• The investigation of frequency dependent on optical conductivity versus electron electron coupling strengths.
• The investigation of optical conductivity for different values of chemical potential.

We investigate the behavior of optical absorption of boron–nitride nanotubes (6,0) in the context of Hubbard model at the paramagnetic sector. GW approximation has been implemented in order to make self-energy matrix of electronic system. Afterwards, the real and imaginary parts of transverse dielectric functions have been obtained using linear response theory. The results show that the frequency gap in the optical absorption decreases with Coulomb repulsion strength. Moreover the results show that the local Coulomb interaction leads to the appearance of the excitonic effects in the optical spectrum. Finally the effects of electronic concentration on the frequency behavior of imaginary part of dielectric function have been investigated.