Anharmonic decay of subterahertz coherent acoustic phonons in GaN

作者：Liu Tzu Ming; Sun Shih Ze; Chang Chieh Feng; Pan Chang Chi; Chen Guan Ting; Chyi Jen Inn; Gusev Vitalyi; Sun Chi Kuang^*

来源：Applied Physics Letters, 2007, 90(4): 041902.

DOI：10.1063/1.2433755

This letter examines the anharmonic decay in GaN of subthermal (h omega < k(B)T) coherent longitudinal acoustic (LA) phonons with a frequency in the subterahertz range. In a collisionless regime (omega tau > 1), the anharmonic decay rate of subterahertz coherent LA phonons in GaN shows square dependence on the phonon frequency and cubic dependence on the crystal temperature. As confirmed by the authors experiments, this behavior agrees with a model based on Herring scattering, indicating its importance for the estimation of acoustic attenuation in the subterahertz range.

• 出版日期2007-1-22
• 单位中央民族大学