direct band gap

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• Band gap — This article is about solid state physics. For voltage control circuitry in electronics, see Bandgap voltage reference. In solid state physics, a band gap, also called an energy gap or bandgap, is an energy range in a solid where no electron… …   Wikipedia

• Direct and indirect band gaps — In semiconductor physics, the band gap of a semiconductor is always one of two types, a direct band gap or an indirect band gap. The band gap is called direct if the momentum of electrons and holes is the same in both the conduction band and the… …   Wikipedia

• Valence band — In solids, the valence band is the highest range of electron energies where electrons are normally present at absolute zero. In semiconductors and insulators, there is a band gap above the valence band, followed by a conduction band above that.… …   Wikipedia

• Conduction band — In the solid state physics field of semiconductors and insulators, the conduction band is the range of electron energies, higher than that of the valence band, sufficient to free an electron from binding with its individual atom and allow it to… …   Wikipedia

• DIRECT — For other uses, see Direct (disambiguation). For the rockets proposed as part of the DIRECT architecture, see Jupiter (rocket family). DIRECT is a proposed alternative heavy lift launch vehicle architecture supporting NASA s Vision for Space… …   Wikipedia

• band theory — In chemistry and physics, a theoretical model describing the states of electrons in solid materials, which can have energy values only within certain specific ranges, called bands. Ranges of energy between two allowed bands are called forbidden… …   Universalium

• Electronic band structure — In solid state physics, the electronic band structure (or simply band structure) of a solid describes ranges of energy that an electron is forbidden or allowed to have. It is due to the diffraction of the quantum mechanical electron waves in the… …   Wikipedia

• Mind the Gap — Album von Scooter Erscheinungsdatum 8. November 2004 Genre Dance Länge (Basic Edition) 42 min 32 sek Länge (Regular Edition / Deluxe Edition – CD1) …   Deutsch Wikipedia

• Spark-gap transmitter — A spark gap transmitter is a device for generating radio frequency electromagnetic waves. These devices served as the transmitters for most wireless telegraphy systems for the first three decades of radio (1887 ndash;1916) and the first… …   Wikipedia

• Mind the Gap (альбом) — Mind The Gap Альбом Scooter …   Википедия

• Yes (band) — Yes Yes in concert, 1977 Left to right: Steve Howe, Alan White, Jon Anderson, Chris Squire, Rick Wakeman Background information Origin London, England …   Wikipedia