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Brillouin zone

About: Brillouin zone is a research topic. Over the lifetime, 13849 publications have been published within this topic receiving 383077 citations.


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TL;DR: A rounded and prominent peak is identified in the near-edge spectrum, among the other well-known spectral features, which is interpreted as originating from interlayer states in low-symmetry regions of the Brillouin zone.
Abstract: We have measured the carbon K near-edge x-ray-absorption fine structure of graphite by transmission, electron yield, and fluorescence yield. A rounded and prominent peak is identified in the near-edge spectrum, among the other well-known spectral features. With the aid of a full-potential linearized augmented-plane-wave band calculation, this feature is interpreted as originating from interlayer states in low-symmetry regions of the Brillouin zone. This finding is relevant to interpreting the near-edge structure of graphite intercalation compounds specially of the alkali-metal type.

145 citations

Journal ArticleDOI
TL;DR: A state-tracking method is proposed for the determination of the magnetocrystalline anisotropy (MCA) energy, in which the spin-orbit coupling perturbed occupied states are defined according to their wave functions as related to the unperturbed occupiedStates, instead of their energies.
Abstract: A state-tracking method is proposed for the determination of the magnetocrystalline anisotropy (MCA) energy, in which the spin-orbit coupling perturbed occupied states are defined according to their wave functions as related to the unperturbed occupied states, instead of their energies. This ensures that the force theorem is well satisfied-a very important feature in all non-self-consistent perturbative procedures. In calculations for the effect of strain on the MCA of an Fe monolayer (using the full-potential linearized augmented plane-wave method), highly stable results were obtained even with a small number of k points (10(2) in the full Brillouin zone) versus the 10(4) points needed previously.

145 citations

Journal ArticleDOI
F. J. Morin1
TL;DR: In this article, the temperature dependence of lattice-scattering mobility in germanium was determined from conductivity, and the result for holes suggests that the valence band is not at the center of the Brillouin zone.
Abstract: The temperature dependence of lattice-scattering mobility in germanium is determined from conductivity It is found to be ${T}^{\ensuremath{-}166}$ for electrons and ${T}^{\ensuremath{-}233}$ for holes The result for holes suggests that the valence band is not at the center of the Brillouin zone The ratio Hall mobility/conductivity mobility is also determined It is found to be constant with temperature at \ensuremath{\sim}105 for electrons The ratio for holes shows significant temperature dependence This suggests that the valence band is composed of multiple surfaces of minimum energy

145 citations

Journal ArticleDOI
TL;DR: In this article, a cubic rock salt structure with a lattice constant unchanged, within experimental error, from the bulk value was examined in the regime where bulk properties are not fully formed.
Abstract: Tiny single PbS crystals of ∼25 A diameter are synthesized and studied optically in low‐temperature colloidal solutions. Electron microscopic examination shows a simple cubic rock salt structure with a lattice constant unchanged, within experimental error, from the bulk value. These crystallites lack the near infrared electronic absorption characteristic of bulk PbS. The small crystallite absorbance in the visible rises more steeply than does the bulk absorbance. These results reflect electron and hole localization if one considers the variation in effective mass across the band structure. A simple discussion of localization anywhere in the Brillouin zone is given. For the first time, crystallite syntheses are carried out in solvent mixtures that form transparent glasses upon cooling. The PbS spectra are independent of temperature (at current experimental resolution) down to 130 K, in contrast to earlier results for quantum size exciton peaks in ∼20 A ZnS crystallites. Previously published observations of size dependence in the excited state electronic properties of AgI and AgBr are explained as consequences of electron and hole localization in the small crystallites. AgBr appears to be the first indirect gap semiconductor to be examined in the regime where bulk properties are not fully formed.

145 citations

Journal ArticleDOI
TL;DR: In this paper, optical fibres heavily doped with alumina are shown to exhibit an exceptionally low Brillouin gain coefficient and an athermal frequency response, which could prove useful for applications that employ fibre sensing or require high-power fibre laser systems.
Abstract: Optical fibres heavily doped with alumina are shown to exhibit an exceptionally low Brillouin gain coefficient and an athermal Brillouin frequency response. Such fibres could prove useful for applications that employ fibre sensing or require high-power fibre laser systems.

144 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023430
2022957
2021463
2020543
2019568
2018587