Energy spectrum and optical absorption of superlattices under strong band inversion conditions
arXiv:1901.06847 · doi:10.1016/j.spmi.2019.03.001
Abstract
We show that in superlattices with a strong band inversion no hybridization gap exists. There are two points where the bands are crossing and the spectrum has a shape of Dirac cones. Due to the absence of the hybridization gap the optical absorption does not have a threshold and goes to zero gradually with the decrease of optical energy.