Minimum thermal conductance in graphene and boron nitride superlattice

The minimum thermal conductance versus supercell size ( d s ) is revealed in graphene and boron nitride superlattice with d s far below the phonon mean free path. The minimum value is reached at a constant ratio of d s / L ≈ 5%, where L is the thickness of the superlattice; thus, the minimum point o...

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Bibliographic Details
Published in:Applied physics letters 2011-07, Vol.99 (4), p.043109-043109-3
Main Authors: Jiang, Jin-Wu, Wang, Jian-Sheng, Wang, Bing-Shen
Format: Article
Language:English
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Summary:The minimum thermal conductance versus supercell size ( d s ) is revealed in graphene and boron nitride superlattice with d s far below the phonon mean free path. The minimum value is reached at a constant ratio of d s / L ≈ 5%, where L is the thickness of the superlattice; thus, the minimum point of d s depends on L . The phenomenon is attributed to the localization property and the number of confined modes in the superlattice. With the increase of d s , the localization of the confined mode is enhanced while the number of confined modes decreases, which directly results in the minimum thermal conductance.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3619832