电子元件与材料2017，Vol.36Issue(1)：27-32,6.DOI:10.14106/j.cnki.1001-2028.2017.01.005
石墨烯声子平均自由程随温度变化规律研究
Temperature-dependent phonon mean free path of graphene
摘要
Abstract
By considering the non-harmonic effect and short-range interaction of atoms, the current work obtained theanalytic functionsof the graphene's phonon mean free path depending on temperature, and theinfluence ofanharmonic vibration on them was also investigated. The theoretical results indicate that the graphene's phonon mean free path decreases nonlinearly with theincreaseof temperature. When the temperature is below 20K, the free path sharply decreases with theincreaseof temperature. Andchanges become gradually slow at the temperature above 300K. All relative change rate(dl/dt) of phonon mean free path is negative and decreaseswith the increase of temperature. The change rate of the free path sharply decreases with theincreaseof temperature when temperatures is below 20K, then the changes gradually slow down. Compared with the results of the harmonic approximation, the anharmonic effects on phonon mean free path and its change rate become more significant with temperature getting higher.关键词
石墨烯/德拜温度/声子平均自由程/非简谐效应/原子短程作用/温度变化率Key words
graphene/Debye temperature/phononmean free path/non-harmonic effect/short-range interaction of atoms/temperature change rate分类
信息技术与安全科学引用本文复制引用
任晓霞,贺长安,查小婷,周恩民,郑瑞伦..石墨烯声子平均自由程随温度变化规律研究[J].电子元件与材料,2017,36(1):27-32,6.基金项目
国家自然科学基金资助（No.11574253）；重庆市教育委员会科学技术研究项目(No. KJ1601118)；重庆文理学院科技项目 （No. KJ1601118）
