Localized states in mixed Ga P z As 1 − z crystals
Localized states in mixed Ga P z As 1 − z crystals
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DOI：
10.1103/physrevb.22.6330
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发表时间：
1980-12
影响因子：
3.7
通讯作者：
D. Schmeltzer;R. Beserman
中科院分区：
文献类型：
--
作者：
D. Schmeltzer;R. Beserman
研究了质量 ${m}_{B}$ 和 ${m}_{C}$ 随机分布的双原子 $A{B}_{z}{C}_{1\ensuremath{-}z}$ 的振动特性。计算是在短程力近似下进行的。描述振动特性的非线性拉格朗日量是通过对随机质量进行平均而获得的。质量无序在平均晶体布里渊区的边缘和中心附近产生连续局域态区域。实验上$\mathrm{Ga}{\mathrm{P}}_{z}{\mathrm{As}}_{1\ensuremath{-}z}$已通过拉曼散射进行了研究；已观察到预测的行为，这解释了声学区域中双模行为的存在，以及光学频率范围内具有 LO 对称性的新峰值的出现。
The vibrational properties of a diatomic $A{B}_{z}{C}_{1\ensuremath{-}z}$ in which the mass ${m}_{B}$ and ${m}_{C}$ are randomly distributed have been investigated. The calculation has been performed in the short-range-forces approximation. A nonlinear Lagrangian which describes the vibrational properties is obtained by averaging over the random mass. The mass disorder creates a region of continuous localized states near the edge and the center of the averaged crystal Brillouin zone. Experimentally $\mathrm{Ga}{\mathrm{P}}_{z}{\mathrm{As}}_{1\ensuremath{-}z}$ has been studied by means of Raman scattering; the predicted behavior has been observed which explains the existence of a two-mode behavior in the acoustical region, as well as the appearance of a new peak with LO symmetry in the range of optical frequencies.