Size Dependent Heat Conduction in One-Dimensional Diatomic Lattices  

作　　者：Tejal N.Shah P.N.Ga jjar 

机构地区：[1]Bhavan's Sheth R.A. College of Science, Khanpur, Ahmedabad 380 001, Gujarat, India [2]Department of Physics, University School of Sciences, Gujarat University, Ahmedabad 380 009, Gujarat, India

出　　处：《Communications in Theoretical Physics》2016年第4期517-522,共6页理论物理通讯（英文版）

基　　金：Computer facility developed under DST-FIST Level–I programme,Department of Science and Technology,Government of India,New Delhi and financial assistance under DRS-SAP-I from University Grants Commission,New Delhi

摘　　要：We study the size dependency of heat conduction in one-dimensional diatomic FPU-β lattices and establish that for low dimensional material,contribution from optical phonons is found more effective to the thermal conductivity and enhance heat transport in the thermodynamic limit N →∞.For the finite size,thermal conductivity of 1D diatomic lattice is found to be lower than 1D monoatomic chain of the same size made up of the constituent particle of the diatomic chain.For the present 1D diatomic chain,obtained value of power divergent exponent of thermal conductivity0.428±0.001 and diffusion exponent 1.2723 lead to the conclusions that increase in the system size,increases the thermal conductivity and existence of anomalous energy diffusion.Existing numerical data supports our findings.

关 键 词：heat conduction thermal conductivity FPU-β diatomic lattice nonequilibrium molecular dynamics 

分 类 号：O551.3[理学—热学与物质分子运动论]