Molecular dynamics simulations on heat conduction in nano-porous Si

Daisuke Nagai, Koji Miyazaki, Hiroshi Tsukamoto

Research output: Contribution to journalArticlepeer-review


We investigate heat conduction of silicon nano-porous structures by molecular-dynamics simulations (MDs). We calculated the phonon dispersion curves of the nano-structured Si to understand the effects of nano-structures on phonon properties, such as phonon group velocity and phonon density of states. The dispersion curves were calculated from MDs results by using the 2D time-space Fourier transformation. Frequency gaps in phonon dispersion curves reduce the phonon group velocity in the periodic nano-porous structures. Moreover the group velocity of phonon is reduced due to new phonon modes even though the nano-porous was random. The results show that nanoporous structures reduce the thermal conductivity as well as superlattices.

Original languageEnglish
Pages (from-to)1879-1883
Number of pages5
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number771
Publication statusPublished - Nov 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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