Srivastava G P
School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK.
J Phys Condens Matter. 2009 Apr 29;21(17):174205. doi: 10.1088/0953-8984/21/17/174205. Epub 2009 Apr 1.
Measured lifetimes of hot phonons in group-III nitrides have been explained theoretically by considering three-phonon anharmonic interaction processes. The basic ingredients of the theory include full phonon dispersion relations obtained from the application of an adiabatic bond charge model and crystal anharmonic potential within the isotropic elastic continuum model. The role of various decay routes, such as Klemens, Ridley, Vallée-Bogani and Barman-Srivastava channels, in determining the lifetimes of the Raman active zone-centre longitudinal optical (LO) modes in BN (zincblende structure) and A(1)(LO) modes in AlN, GaN and InN (wurtzite structure) has been quantified.
通过考虑三声子非谐相互作用过程，从理论上解释了III族氮化物中热声子的测量寿命。该理论的基本要素包括在各向同性弹性连续介质模型中，通过应用绝热键电荷模型和晶体非谐势获得的完整声子色散关系。已经量化了各种衰变途径的作用，如克莱门斯、里德利、瓦莱-博加尼和巴尔曼-斯里瓦斯塔瓦通道，它们在确定BN（闪锌矿结构）中拉曼活性区中心纵向光学（LO）模式以及AlN、GaN和InN（纤锌矿结构）中A(1)(LO)模式的寿命方面所起的作用。
