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Cluster models of ionic crystals: Band gaps

✍ Scribed by M. Berrondo; J. F. Rivas-Silva

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
395 KB
Volume
57
Category
Article
ISSN
0020-7608

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✦ Synopsis

We performed electronic ab initio calculations of ion clusters simulating a piece of ionic crystal. Our main interest here is to estimate the (direct) energy band gap from the cluster energy levels. The model consists of a central cation surrounded by four shells of ions, with additional point charges embedding the cluster. We present results for the series of alkali halides with rock-salt structure. 0

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## Abstract The co‐directional coupling between two photonic band gap (PBG) waveguides is studied. The designs of PBG waveguide couplers with different lattice arrangements are presented and their coupling characteristics are studied. Further, their application in the design of ultra‐short optical