Linear Optical Susceptibility of Single‐Walled Boron Nitride Nanotubes

Abstract

Abstract A simple model based on an effective‐mass approximation is developed to describe the dispersion behavior of the linear optical susceptibility χ1 Marinopoulos, A. G., Wirtz, L., Marini, A., Olevano, V., Rubio, A. and Reining, L. 2004. Optical absorption and electron energy loss spectra of carbon and boron nitride nanotubes: A first principles approach. Appl. Phys. A, 78: 1157–1167. [Crossref], [Web of Science ®] , [Google Scholar] of an array of aligned, identical single‐walled boron nitride nanotubes (BNNTs) in the spectral range where interband π‐electron transitions dominate. An analytic closed‐form expression for χ(1) valid in the low‐frequency part of the spectrum is obtained in terms of the band gap Δ g of BNNTs and the π‐electron transfer integral V ppπ. To the best of our knowledge, the present analytic calculation is the first for such nanotubes.