Phonon scattering in graphene over substrate steps

Haldun Sevincli, Mads Brandbyge

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Abstract

We calculate the effect on phonon transport of substrate-induced bends in graphene. We consider bending induced by an abrupt kink in the substrate, and provide results for different step-heights and substrate interaction strengths. We find that individual substrate steps reduce thermal conductance in the range between 5% and 47%. We also consider the transmission across linear kinks formed by adsorption of atomic hydrogen at the bends and find that individual kinks suppress thermal conduction substantially, especially at high temperatures. Our analysis show that substrate irregularities can be detrimental for thermal conduction even for small step heights.
Original languageEnglish
JournalApplied Physics Letters
Volume105
Issue number15
Pages (from-to)153108
Number of pages4
ISSN0003-6951
DOIs
Publication statusPublished - 2014

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