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Band gap in NiO: A cluster study
Physical Review B, 1988The Mott-Hubbard gap U and the charge-transfer gap \ensuremath{\Delta} of solid NiO are estimated from ab initio calculations on the ${\mathrm{NiO}}_{6}^{10\mathrm{\ensuremath{-}}}$ cluster. Covalency in the essentially localized ${d}^{n}$ states and localization for the spatially extended O(2p) hole states are introduced by means of a limited ...
JANSSEN, GJM, NIEUWPOORT, WC
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1990
The distinction between valence and conduction bands is discussed. Insulators, semiconductors, metals. Electrons and holes definition. Effective mass; sign convention of charge, mass and mobility. Semi-metals and narrow gap semiconductors. Band parameters for typical semiconductors, table. Constant energy surfaces in Brillouin zones.
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The distinction between valence and conduction bands is discussed. Insulators, semiconductors, metals. Electrons and holes definition. Effective mass; sign convention of charge, mass and mobility. Semi-metals and narrow gap semiconductors. Band parameters for typical semiconductors, table. Constant energy surfaces in Brillouin zones.
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Electromagnetic Band gap Structures
2007 IEEE Antennas and Propagation Society International Symposium, 2007Various features about the application of EBG materials in printed antenna design and electromagnetic scattering are presented and methods of analysis are introduced. It is shown that a microstrip antenna with EBG or PMC surface has a larger directivity and lower side and back lobe levels. Numerical results are presented.
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Study of Band-Gap Characteristics for Curved Electromagnetic Band-Gap Structures
TENCON 2006 - 2006 IEEE Region 10 Conference, 2006According to the reflection condition of optics Bragg, a curved electromagnetic band-gap structures is designed, and the band-gap characteristics of it is studied deeply. The effect of electromagnetic band-gap structure parameters and cylindrical structure parameters on band-gap characteristics are analyzed for the filrst time, and some useful ...
Tao Liu +3 more
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Plasma expansion and band-gap renormalization in CdTe and GaP
Journal of Luminescence, 1985Abstract Detailed experimental and theoretical investigations, based on direct excite and probe experiments and on line-shape analysis, on the influence of many-body interaction, polar interaction, and transport effects on the energetic position and shape of the electron-hole plasma (EHP) emmission are reported.
H. SCHWEIZER, E. ZIELINSKI
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CLEO/Europe Conference on Lasers and Electro-Optics, 1998
Photonic band gaps are ranges of frequency within which electromagnetic propagation is completely forbidden. They are present in certain materials which possess a periodicity of permittivity at the wavelength scale. Materials with these extreme properties are not known to occur naturally, and.
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Photonic band gaps are ranges of frequency within which electromagnetic propagation is completely forbidden. They are present in certain materials which possess a periodicity of permittivity at the wavelength scale. Materials with these extreme properties are not known to occur naturally, and.
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Diamondlike photonic band-gap crystal with a sizable band gap
Physical Review B, 1997openaire +1 more source
Band Gap States of Cr in the Lower Part of the SiC Band Gap
Materials Science Forum, 2001G. Pasold +3 more
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