Graphene-based thermal modulators

作     者：Xiangjun Liu Gang Zhang Yong-Wei Zhang 

作者机构：Institute of High Performance Computing A＊STAR Singapore 138632 Singapore 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2015年第8卷第8期

页      面：2755-2762页

核心收录：

学科分类：080902[工学-电路与系统] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Agency for Science  Technology and Research (A*STAR)  Singapore 

主　　题：graphene thermal modulator molecular dynamics thermal conductivity phonon dispersion 

摘      要：The quest for materials and devices that are capable of controlling heat flux continues to fuel research on thermal controlling devices. In this letter, using molecular dynamics simulations, we demonstrate that a partially clamped singlelayer graphene can serve as a thermal modulator. The mismatch in phonon dispersion between the unclamped and clamped graphene sections results in phonon interface scattering, and the strength of interface scattering is tunable by controlling the clamp-graphene distance via applying the external pressure. Owing to the ultra-thin structure of graphene and its highly sensitive phonon dispersion to external physical interaction, the modulation efficiency--which is defined as the ratio of the highest to lowest heat flux-can reach as high as 150% at a moderate pressure of 50 GPa. This modulation efficiency can be further enhanced by arranging a number of clamps in series along the direction of the heat flux.