ABSTRACT

This chapter investigates the influence of low dimensionality and disorder in phonon transport in ultranarrow armchair graphene nanoribbons (AGNRs) using nonequilibrium Green's function simulation techniques. It specifically focuses on how different parts of the phonon spectrum are influenced by geometrical confinement and line edge roughness. The chapter discusses how the introduction of line edge roughness does not significantly affect the acoustic modes, which still remain the main heat carriers, but how it significantly affects regions of the phonon spectrum with a low density of phonon modes. It theoretically describes the effect of the Line edge roughness and confinement in phonon transport in ultranarrow AGNRs for the phonon modes of the entire energy spectrum independently. The chapter also describes the models and methods employ to calculate the phonon spectrum and phonon transport. It discusses the effects of disorder and confinement on thermal conductivity.