Anisotropic damping of longitudinal optical phonon-plasmon coupling modes of InN films

被引：12

作者：

Ishitani, Yoshihiro ^{[1
]}

Fujiwara, Masayuki ^{[1
]}

Wang, Xinqiang ^{[1
]}

Che, Song-Bek ^{[1
]}

Yoshikawa, Akihiko ^{[1
]}

机构：

[1] Chiba Univ, InN Project CREST Program, Venture Business Lab, Grad Sch Elect & Elect Engn,Inage Ku, Chiba 2638522, Japan

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 25期

关键词：

18;

D O I：

10.1063/1.2951614

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The energy broadenings of the higher energy branch of the longitudinal optical (LO) phonon-plasmon coupling modes for E-1(LO) and A(1)(LO) are analyzed for InN films by infrared reflectance and spectroscopic ellipsometry. Larger broadening for the vibration parallel to c of A(1)(LO)-plasmon coupling is found with the decrease in electron density. This phenomenon is caused by the plasmon lifetime anisotropy, and is attributed to the reduction in crystal defects causing isotropic carrier scattering and the remaining of defects along the c axis such as threading dislocations and columnar grain boundaries. (C) 2008 American Institute of Physics.

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