Observation of vacancy-induced suppression of electronic cooling in defected graphene

Abstract

Previous studies of electron-phonon interaction in impure graphene have found that static disorder can give rise to an enhancement of electronic cooling. We investigate the effect of dynamic disorder and observe over an order of magnitude suppression of electronic cooling compared with clean graphene. The effect is stronger in graphene with more vacancies, confirming its vacancyinduced nature. The dependence of the coupling constant on the phonon temperature implies its link to the dynamics of disorder. Our study highlights the effect of disorder on electron-phonon interaction in graphene. In addition, the suppression of electronic cooling holds great promise for improving the performance of graphene-based bolometer and photo-detector devices.

Multiple exciton generation in chiral carbon nanotubes: Density functional theory based computation

“…One sets R I = R 0 I + r I , where the equilibrium ion positions R 0 I corresponding to the energy minimum have been found by, e.g., the DFT geometry relaxation procedure, and r I are small oscillations about equilibrium. This leads to the following phonon and electron-phonon terms in the Hamiltonian (see, e.g., [53,54])…”