2014/05/31 by Raúl Rengel, R. Rengel, E. Pascual +3
Chemistry · Materials Science · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Diffusion #Graphene research and applications #Momentum (technical analysis) #Monte Carlo method #Phonon #Polar #Relaxation (psychology) #Surface diffusion #Thermal diffusivity #Thermal properties of materials #cond-mat.mes-hall
paper · pdf · doi:10.1063/1.4882238
published as Appl. Phys. Lett. 104, 233107 (2014) · 10 pages, 5 figures Typographical errors corrected; journal reference included
openalex publication_date 2014/06/09 · arxiv created 2014/06/10 · arxiv updated 2014/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Knowing the influence of the substrate type on the diffusion coefficient and the momentum relaxation in graphene is of great importance for the development of new device models specifically adapted to the peculiarities of this material. In this work, the influence of surface polar phonons at low and high electric fields is evaluated by means of ensemble Monte Carlo simulations for several types of substrates. The results show that at low fields, surface polar phonons have a major role on reducing the scattering time, breaking the correlation of velocity fluctuations, and degrading the diffusion coefficient. At high fields, the differences with regard to suspended samples in terms of diffusivity and momentum relaxation tend to reduce, providing at the same time larger saturation velocities, particularly for h-BN.