Nature of microscopic heat carriers in nanoporous silicon

Aleandro Antidormi, Xavier Cartoixà, Luciano Colombo

Research output: Contribution to journalArticleResearchpeer-review

5 Citations (Scopus)


© 2018 American Physical Society. We performed a systematic analysis of the vibrational modes in nanoporous silicon for different values of porosity, separating them into extended modes (diffusons and propagons) and localized vibrations (locons). By calculating the density of states, the participation ratio, and the systems' dispersion curves, the spatial character of each mode as well as the effect of porosity on the thermal conductivity have been investigated. An increase of porosity is shown to promote the existence of increasingly localized modes on one side, and the progressive transformation of propagons to diffusons on the other. Finally, we provide evidence of the sizable contribution of locons to thermal transport found in large porosity samples and discuss the mechanism of energy transfer in terms of mode-mode autocorrelations and cross-correlations.
Original languageEnglish
Article number056001
JournalPhysical review materials
Issue number5
Publication statusPublished - 11 May 2018


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