Phonon-Plasmon Scattering and Localization in Graphene Structures

In this paper we discuss about a self-consistent model of phonon-plasmon coupled dynamics and investigate the nature of the coupling in the graphene nanostructures. Effect of length-scale in three types of structures namely graphene nano-ribbon, graphene on silicon and graphene defects are investigated. Nonlinear conversion arising from aperiodic localization of phonon modes in the nanoribbon are observed. We show how the chirality plays a role on this relationship. Effect of silicon substrate atoms on the dynamics are analyzed. We then review the present understanding and new ways to design thermal energy transport in graphene based optoelectronic devices. Another aspect of phonon generation is plasmonic extinction due to RF, field emission or lasing with application in filters or sensors. In context of these ideas, we show how the structure of defects in graphene alters the plasmonic extinction. The charge localization around the defects are studied in details and the stability limits of the defects in terms of size and shape are analyzed. To this end, new results showing signature of these instabilities in the optical spectra and phonon spectra will be discussed.