The dimensionality effect on phonon localization in graphene/hexagonal boron nitride superlattices

doi:10.1088/2053-1583/ab93e2

CORC > 宁波材料技术与工程研究所 > 中国科学院宁波材料技术与工程研究所 > 2020专题

	The dimensionality effect on phonon localization in graphene/hexagonal boron nitride superlattices
	Ma, Tengfei; Lin, Cheng-Te; Wang, Yan
刊名	2D MATERIALS
	2020
卷号	7 期号:3
关键词	THERMAL-CONDUCTIVITY GRAPHENE NANOMESH TRANSPORT HETEROSTRUCTURES DIFFUSION COHERENT ABSENCE
DOI	10.1088/2053-1583/ab93e2
英文摘要	Phonon localization, a largely elusive phenomenon, has a great promise for improving current applications like thermoelectric materials and thermal barrier coatings. By freezing the out-of-plane atomic motion in graphene/hexagonal boron nitride (hBN) superlattices and random multilayers, i.e aperiodic superlattices, we are able to completely isolate the effect of the third dimension on phonon scattering and localization in 2D materials. In particular, we find much more prominent phonon heat conduction and localization when atomic motions in the third dimension are frozen. Rigorous spectral phonon transmission and scattering phase space analyses reveal that the phase-breaking anharmonic scatterings can significantly hinder the occurrence of phonon localization. Phonon participation ratio calculations further reveal that the flexural modes-arising from the degree of freedom of the third dimension-are rather extended, in contrast to the vastly localized in-plane modes in graphene/hBN random multilayers. These two factors altogether greatly obstruct the observation of coherent phonon localization in realistic materials. This work will be useful for guiding the search for nanostructures possessing significant phonon localization behaviors.
学科主题	Materials Science
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/20680]
专题	2020专题
作者单位	Wang, Y (corresponding author), Univ Nevada, Dept Mech Engn, Reno, NV 89557 USA.
推荐引用方式 GB/T 7714	Ma, Tengfei,Lin, Cheng-Te,Wang, Yan. The dimensionality effect on phonon localization in graphene/hexagonal boron nitride superlattices[J]. 2D MATERIALS,2020,7(3).
APA	Ma, Tengfei,Lin, Cheng-Te,&Wang, Yan.(2020).The dimensionality effect on phonon localization in graphene/hexagonal boron nitride superlattices.2D MATERIALS,7(3).
MLA	Ma, Tengfei,et al."The dimensionality effect on phonon localization in graphene/hexagonal boron nitride superlattices".2D MATERIALS 7.3(2020).