TY - JOUR
T1 - Ballistic and Diffusive Thermal Conductivity of Graphene
AU - Saito, Riichiro
AU - Mizuno, Masashi
AU - Dresselhaus, Mildred S.
N1 - Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/2/20
Y1 - 2018/2/20
N2 - This paper is a contribution to the Physical Review Applied collection in memory of Mildred S. Dresselhaus.Phonon-related thermal conductivity of graphene is calculated as a function of the temperature and sample size of graphene in which the crossover of ballistic and diffusive thermal conductivity occurs at around 100 K. The diffusive thermal conductivity of graphene is evaluated by calculating the phonon mean free path for each phonon mode in which the anharmonicity of a phonon and the phonon scattering by a C13 isotope are taken into account. We show that phonon-phonon scattering of out-of-plane acoustic phonon by the anharmonic potential is essential for the largest thermal conductivity. Using the calculated results, we can design the optimum sample size, which gives the largest thermal conductivity at a given temperature for applying thermal conducting devices.
AB - This paper is a contribution to the Physical Review Applied collection in memory of Mildred S. Dresselhaus.Phonon-related thermal conductivity of graphene is calculated as a function of the temperature and sample size of graphene in which the crossover of ballistic and diffusive thermal conductivity occurs at around 100 K. The diffusive thermal conductivity of graphene is evaluated by calculating the phonon mean free path for each phonon mode in which the anharmonicity of a phonon and the phonon scattering by a C13 isotope are taken into account. We show that phonon-phonon scattering of out-of-plane acoustic phonon by the anharmonic potential is essential for the largest thermal conductivity. Using the calculated results, we can design the optimum sample size, which gives the largest thermal conductivity at a given temperature for applying thermal conducting devices.
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U2 - 10.1103/PhysRevApplied.9.024017
DO - 10.1103/PhysRevApplied.9.024017
M3 - Article
AN - SCOPUS:85043487675
VL - 9
JO - Physical Review Applied
JF - Physical Review Applied
SN - 2331-7019
IS - 2
M1 - 024017
ER -