Now showing items 1-9 of 9

    • Cluster scattering effects on phonon conduction in graphene 

      Mingo, Natalio; Esfarjani, Keivan; Broido, David; Stewart, Derek (American Physical Society, 2010-01-13)
      The phonon-scattering cross section associated with isotopic clusters is evaluated from first principles and used to estimate the reduction in thermal conductance of wide graphene samples. A strong sensitivity of the ...
    • Intrinsic lattice thermal conductivity of semiconductors from first principles 

      Broido, David; Malorny, Michael; Birner, Gerd; Mingo, Natalio; Stewart, Derek (American Institute of Physics, 2007-12-07)
      We present an ab initio theoretical approach to accurately describe phonon thermal transport in semiconductors and insulators free of adjustable parameters. This technique combines a Boltzmann transport formalism with ...
    • Phonon transmission through defects in carbon nanotubes from first principles 

      Mingo, Natalio; Stewart, Derek A; Broido, David A; Srivastava, Deepak (American Physical Society, 2008-01-30)
      We compute the effect of different isolated defects on the phonon transmission through carbon nanotubes, using an ab initio density functional approach. The problem of translational and rotational invariance fulfillment in ...
    • Phonon Transport in Isotope-Disordered Carbon and Boron-Nitride Nanotubes: Is Localization Observable? 

      Savic, Ivana; Mingo, Natalio; Stewart, Derek (American Physical Society, 2008-10-13)
      We present an ab initio study which identifies dominant effects leading to thermal conductivity reductions in carbon and boron-nitride nanotubes with isotope disorder. Our analysis reveals that, contrary to previous ...
    • Role of light and heavy embedded nanoparticles on the thermal conductivity of SiGe alloys 

      Kundu, Anupam; Mingo, Natalio; Broido, David; Stewart, Derek (American Physical Society, 2011-09-09)
      We have used an atomistic ab initio approach with no adjustable parameters to compute the lattice thermal conductivity of Si0.5Ge0.5 with a low concentration of embedded Si or Ge nanoparticles of diameters up to 4.4 nm. ...
    • Thermal conduction mechanisms in boron nitride nanotubes: Few-shell versus all-shell conduction 

      Savic, Ivana; Stewart, Derek; Mingo, Natalio (American Physical Society, 2008-12-29)
      It has been argued that the experimentally observed limitation of heat transport through boron nitride nanotubes is due to intershell scattering rather than to inefficient heat transfer to inner shells. Using an atomistic ...
    • Thermal conductivity of bulk and nanowire Mg2Si_{x}Sn_{1-x} alloys from first principles 

      Li, Wu; Lindsay, Lucas; David, Broido; Stewart, Derek; Mingo, Natalio (American Physical Society, 2012-11-29)
      The lattice thermal conductivity (κ) of the thermoelectric materials, Mg2Si, Mg2Sn, and their alloys, are calculated for bulk and nanowires, without adjustable parameters. We find good agreement with bulk experimental ...
    • Thermal conductivity of diamond nanowires from first principles 

      Li, Wu; Mingo, Natalio; Lindsay, Lucas; Broido, David; Stewart, Derek; Katcho, Nebil (American Physical Society, 2012-05-17)
      Using ab initio calculations we have investigated the thermal conductivity (k) of diamond nanowires, unveiling unusual features unique to this system. In sharp contrast with Si, k(T) of diamond nanowires as thick as 400 ...
    • Thermal conductivity of indium arsenide nanowires with wurtzite and zinc blende phases 

      Zhou, Feng; Moore, Arden; Bolinsson, Jessica; Persson, Ann; Froberg, Linus; Pettes, Michael; Kong, Huijun; Rabenberg, Lew; Caroff, Philippe; Stewart, Derek; Mingo, Natalio; Dick, Kimberly; Samuelson, Lars; Linke, Heiner; Shi, Li (American Physical Society, 2011-05-19)
      The thermal conductivity of wurtzite and zinc blende indium arsenide nanowires was measured using a microfabricated device, with the crystal structure of each sample controlled during growth and determined by transmission ...