Phonon hydrodynamics in two-dimensional materials

The conduction of heat in two dimensions displays a wealth of fascinating phenomena of key relevance to the scientific understanding and technological applications of graphene and related materials. Here, we use density-functional perturbation theory and an exact, variational solution of the Boltzmann transport equation to study fully from first-principles phonon transport and heat conductivity in graphene, boron nitride, molybdenum disulphide and the functionalized derivatives graphane and fluorographene. In all these materials, and at variance with typical three-dimensional solids, normal processes keep dominating over Umklapp scattering well-above cryogenic conditions, extending to room temperature and…

• NS
  National Science Foundation
• GF
  Graphene Flagship
• AN
  Agence Nationale de la Recherche
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
• NS
  National Supercomputing Center, Korea Institute of Science and Technology Information