Minimumthermalconductancein创新.PDFVIP

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Minimum thermal conductance in graphene and boron nitride superlattice Jin-Wu Jiang∗ and Jian-Sheng Wang 1 Department of Physics and Centre for Computational Science and Engineering, 1 0 National University of Singapore, Singapore 117542, Republic of Singapore 2 g u Bing-Shen Wang A 0 State Key Laboratory of Semiconductor Superlattice 3 and Microstructure and Institute of Semiconductor, ] i Chinese Academy of Sciences, Beijing 100083, China c s l- (Dated: August 31, 2011) r t m Abstract . t a The minimum thermal conductance versus supercell size (d ) is revealed in graphene and boron s m - nitride superlattice with ds far below the phonon mean free path. The minimum value is reached at d n a constant ratio of d /L ≈ 5%, where L is the total length of the superlattice; thus the minimum s o c point of ds 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 , the localization of the 1 s v 6 confined mode is enhanced while the number of confined modes decreases, which directly results 0 8 in the minimum thermal conductance. 5 . 8 Keywords: graphene, hexagonal boron nitride, superlattice, thermal conductance, confined phonon mode 0 1 1 : v i X r a ∗Electronic address: phyjj@nus.edu.sg

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