Divergence of the thermal conductivity in uniaxially strained graphene

被引：132

作者：

Pereira, Luiz Felipe C. ^{[1
]}

Donadio, Davide ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 12期

关键词：

MOLECULAR-DYNAMICS; TRANSPORT; LATTICES; NANORIBBONS; SIMULATIONS; CARBON;

D O I：

10.1103/PhysRevB.87.125424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the effect of strain and isotopic disorder on thermal transport in suspended graphene by equilibrium molecular dynamics simulations. We show that the thermal conductivity of unstrained graphene, calculated from the fluctuations of the heat current at equilibrium, is finite and converges with size at finite temperature. In contrast, the thermal conductivity of strained graphene diverges logarithmically with the size of the models, when strain exceeds a relatively large threshold value of 2%. An analysis of phonon populations and lifetimes explains the divergence of the thermal conductivity as a consequence of changes in the occupation of low-frequency out-of-plane phonons and an increase in their lifetimes due to strain. DOI: 10.1103/PhysRevB.87.125424

引用

页数：6

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