声子晶体中声子频率带隙与散射截面的关系

用平面波方法,研究了Pb圆柱体在环氧树脂基体中按周期性排列构成的声子晶体中弹性波频率带结构,同时计算了弹性波在这种二维周期性复合介质中的散射截面,阐述了声子频率带隙与散射截面的关系.     

Interaction of Phonons and Yhermoequilibrium of a Crystal

The interaction of phonons and the thermoequilibrium of a crystal are analyzed with Boltzmann equation and Landau equation.The thermoequilibrium of a crystal is the result of interaction of phonons.There is no interaction of phonons in the harmonic approximation. A cbystal can not reach the state of thermoequilibrium in the harmonic approximation.