Comment on 'Zener tunneling in semiconducting nanotubes and graphene nanoribbon p-n junctions' [Appl. Phys. Lett. 93,112106 (2008)]

摘要

In a recent letter, Jena et al. calculated the transmission coefficient for tunneling through the bandgap for carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) for the case of constant electric field using the Wentzel-Kramer-Brillouin (WKB) approximation.2 In this comment, I point out that energy conservation was applied incorrectly in Ref. 1, which led to an incorrect expression for the imaginary wave vector but, surprisingly enough, led to the correct expression for transmission coefficient.