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• W1589652626 abstract "Summary Until theory and experiment reach new levels of precision, the physics of semiconductor alloys, whether superlattices or not, appears to be adequately treated by the recursion method and a Born-von Karman model such as those described here. But light-scattering studies such as resonant Raman scattering spectroscopy are beginning to provide new and precise information about vibrations in alloys, and, when analyzed with improved models of long-ranged forces, will no doubt allow very detailed comparisons of theory with data. A better understanding of correlations in alloys should follow, and will involve the theory of phase transitions as well. In summary, the recursion method provides a very good way to understand the phonon spectra of the semiconductor alloys discussed here, as well as the spectra of other III-V and II-VI alloys (Amirthara et al. 1985; Fu and Dow 1987; Lucovsky et al. 1975, 1976). While this method provides a satisfactory description of the density of states per squared frequency in an alloy, its primary limitation is that it normally does not provide matrix elements (which can be calculated for large clusters (Ren and Dow 1992), but not for clusters so large as those amenable to treatment with the recursion method). The discussion of one-mode versus two-mode k = 0 optical phonon behavior is seen to be largely moot: unless the masses of the atoms are virtually equal, one invariably finds two-mode behavior, but one of the modes may be resonant with a phonon continuum, and therefore may not be visible. The phonon spectra of the substitutional crystalline semiconducting alloys are nearly “persistent”, but the deviations from this persistent behavior are the alloy modes, and those modes are the subject of investigations of alloy physics. (One should not claim success for an elegant theory that does little more than reproduce the persistent limit!) The advantage of the recursion method as applied to the alloy physics of the semiconductor alloys is that it can be dissected to associate specific features of a spectrum with particular local configurations. With the Redfield method of generating correlated clusters, and with the separation of the alloy problem into the following parts: (i) determination of the cluster (correlated or not), (ii) evaluation of the forces, and (iii) computation of the density of states, it is now possible to predict the main properties of the substitutional crystalline alloy semiconductors. The present work assumed that all of the atoms of the alloy occupied crystalline sites on a zinc-blende lattice. Of course, with strains in the materials, and with diffusion at finite temperatures, this assumption will not be 100% valid. Therefore, one of the next major problems to be addressed is the physics of substitutional nearly-crystalline alloys whose crystal structures deviate from the perfect geometry of the zinc-blende structure, due to strain, for example. This will be interesting from the viewpoint of pure physics, and it has important technological implications: interfaces between alloy semiconductors exhibit interdiffusion, and this interdiffusion is one of the elements scattering electrons and limiting the electronic mobility - and hence limiting the performance of high-speed optoelectronic devices based on these materials." @default.
• W1589652626 created "2016-06-24" @default.
• W1589652626 creator A5001276863 @default.
• W1589652626 creator A5008668497 @default.
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• W1589652626 date "1995-01-01" @default.
• W1589652626 modified "2023-09-27" @default.
• W1589652626 title "Chapter 5 Phonons in semiconductor alloys" @default.
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