By Manuel Cardona, G. Guntherodt
This is often the 6th quantity of a well-established and renowned sequence during which professional practitioners talk about topical elements of sunshine scattering in solids. This quantity discusses contemporary result of Raman spectroscopy of excessive Tc superconductors, natural polymers, infrequent earth compounds, semimagnetic superconductors, and silver halides, in addition to advancements within the quickly transforming into box of time-resolved Raman spectroscopy. Emphasis is put on acquiring information regarding basic excitations, the elemental homes of fabrics, and using Raman spectroscopy as an analytical device. This quantity will be considered as an encyclopedia of condensed topic physics from the perspective of the Raman spectroscopist. will probably be valuable to complicated scholars and to all researchers who follow Raman spectroscopy of their paintings.
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Extra resources for Light Scattering in Solids V
Sample text
The wave localized on each interface may be viewed as a Wannier function in the tight-binding version of electron energy band theory. By virtue of their overlap, the waves link together to form a propagating Bloch state. In essence, we have the analog of a tight-binding band in a crystal with two atoms per unit cell. One interface in each unit cell has a B film above and an A film below, and the other the opposite ordering. For each choice of kll, we will thus find two collective mode bands, because the interface modes link together to form Bloch states which transport energy normal to the interfaces.
L. 45b) d=d~ + d 2 is the period of the superlattice. Notice that the above dispersion relation is an even function o f k II, i. , we have collective modes which propagate in either direction across the magnetization. For one sign ofklf, these are composed of modes which are localized on the upper surface of each ferromagnet, while for the other sign they are localized on the lower surface. , we have a semi-infinite superlattice as illustrated in Fig. 7a, we encounter the possibility of having collective spin waves localized near the surface, similar to the surface modes of the dielectric superlattice discussed in Sect.
26) still describes the surface acoustic plasmon when klf dB'~ 1. On the other hand, the frequency of the upper branch, which is now the collective mode branch to which the inter-subband excitations contribute importantly, approaches (co21+ t221/e)m in this limit. This is the frequency of the inter-subband transition stiffened by the surface depolarization field, as discussed first by Chen et al. 13]. Experimental studies of collective excitations in superlattices are reviewed in Chaps. 3 and 4 of this volume.