By Michael A. Stroscio
This e-book makes a speciality of the speculation of phonon interactions in nanoscale constructions with specific emphasis on glossy digital and optoelectronic units. A key aim is to explain tractable types of restrained phonons and the way those are utilized to calculations of uncomplicated houses and phenomena of semiconductor heterostructures. the extent of presentation is suitable for undergraduate and graduate scholars in physics and engineering with a few history in quantum mechanics and strong nation physics or units.
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Additional resources for Phonons in Nanostructures
1996, 1997, 1998). The electron-LO-phonon scattering rate was seen to be an order of magnitude larger than that for GaAs and was attributed to the much larger ionicity in GaN. These experiments also indicated that the longitudinal phonons decay into a TO and an LO phonon or two TO phonons. Raman investigations of phonon lifetimes have been reported by Bergman et al. (1999) in GaN, AIN, and ZnO wiirtzite crystals. These lifetimes were obtained from measured Raman linewidths using the uncertainty relation, after correcting 31 4 Raman properties of bulk phonons 32 Ei for instrument broadening (Di Bartolo, 1969).
Tsen et al. (1996, 1997, 1998) have studied the electron-phonon interactions in GaN of wurtzite structure via picosecond and sub-picosecond Raman spectroscopy. Results on undoped GaN with an electron density of n = 5 x 1016 cm-3 showed that the relaxation mechanism of the hot electrons is via the emission of LO phonons and that the Frohlich interaction is much stronger than the deformation-potential interaction in that material. , 1996, 1997, 1998). The electron-LO-phonon scattering rate was seen to be an order of magnitude larger than that for GaAs and was attributed to the much larger ionicity in GaN.
Other processes that give experimental information on the electron-phonon interaction include the generation of optical phonons by highenergy carriers, intervalley scattering between different minima in the conduction band, and carrier-carrier scattering; these are reported by Kash and Tsang (1991) for the prototypical system of GaAs. Measurements of phonon linewidths for Raman and infrared measurements in GaAs, ZnSe, and GaP give phonon lifetimes of 2-10 ps (von der Linde, 1980; Menendez and Cardona, 1984).