Nonequilibrium Green’s function method for phonon-phonon interactions and ballistic-diffusive thermal transport

  title={Nonequilibrium Green’s function method for phonon-phonon interactions and ballistic-diffusive thermal transport},
  author={Yong Xu and Jian-Sheng Wang and Wenhui Duan and Bing-lin Gu and Baowen Li},
  journal={Physical Review B},
Phonon-phonon interaction is systematically studied by nonequilibrium Green's function (NEGF) formulism in momentum space at finite temperatures. Within the quasi-particle approximation, phonon frequency shift and lifetime are obtained from the retarded self-energy. The lowest order NEGF provides the same phonon lifetime as Fermi's golden rule. Thermal conductance is predicted by the Landauer formula with a phenomenological transmission function. The main advantage of our method is that it… 

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