Phonon hydrodynamics in two-dimensional materials

被引：433

作者：

Cepellotti, Andrea ^{[1
,2
]}

Fugallo, Giorgia ^{[1
,3
]}

Paulatto, Lorenzo ^{[3
]}

Lazzeri, Michele ^{[3
]}

Mauri, Francesco ^{[3
]}

Marzari, Nicola ^{[1
,2
]}

机构：

[1] Ecole Polytech Fed Lausanne, Theory & Simulat Mat THEOS, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Natl Ctr Computat Design & Discovery Novel Mat MA, CH-1015 Lausanne, Switzerland

[3] Univ Paris 06, Sorbonne Univ, UMR CNRS 7590, Musem Natl Hist Nat,IMPMC,IRD UMR 206, F-75005 Paris, France

来源：

NATURE COMMUNICATIONS | 2015年 / 6卷

基金：

瑞士国家科学基金会;

关键词：

2ND SOUND; THERMAL-CONDUCTIVITY; GRAPHENE; MODEL;

D O I：

10.1038/ncomms7400

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The conduction of heat in two dimensions displays a wealth of fascinating phenomena of key relevance to the scientific understanding and technological applications of graphene and related materials. Here, we use density-functional perturbation theory and an exact, variational solution of the Boltzmann transport equation to study fully from first-principles phonon transport and heat conductivity in graphene, boron nitride, molybdenum disulphide and the functionalized derivatives graphane and fluorographene. In all these materials, and at variance with typical three- dimensional solids, normal processes keep dominating over Umklapp scattering well-above cryogenic conditions, extending to room temperature and more. As a result, novel regimes emerge, with Poiseuille and Ziman hydrodynamics, hitherto typically confined to ultra-low temperatures, characterizing transport at ordinary conditions. Most remarkably, several of these two-dimensional materials admit wave-like heat diffusion, with second sound present at room temperature and above in graphene, boron nitride and graphane.

引用

页数：7