conduction band

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Conduction band

The electronic energy band of a crystalline solid which is partially occupied by electrons. The electrons in this energy band can increase their energies by going to higher energy levels within the band when an electric field is applied to accelerate them or when the temperature of the crystal is raised. These electrons are called conduction electrons, as distinct from the electrons in filled energy bands, which, as a whole, do not contribute to electrical and thermal conduction. In metallic conductors the conduction electrons correspond to the valence electrons (or a portion of the valence electrons) of the constituent atoms. In semiconductors and insulators at sufficiently low temperatures, the conduction band is empty of electrons. Conduction electrons come from thermal excitation of electrons from a lower energy band or from impurity atoms in the crystal. See Band theory of solids, Electric insulator, Semiconductor, Valence band

conduction band

[kən′dək·shən ‚band]
(solid-state physics)
An energy band in which electrons can move freely in a solid, producing net transport of charge.
References in periodicals archive ?
This is the first time that strong nuclear spin polarisation of a defect atom in a solid is demonstrated at room temperature by spin-polarised conduction electrons.
The surface resistance is inversely proportional to the conduction electrons present in the surface region, ns i.
It consists of two different types of electrons, the localized spins whose charge degrees of freedom are suppressed and the conduction electrons that propagate as charge carriers.
The conduction electron density and normal-state conductivity are also one to two orders-of-magnitude higher than either the Nb-based alloys or Bi-based cuprates used in present day wires, contradicting the conventional wisdom that good superconductors are poor conductors because of the strong electron-phonon interaction and at the same time providing encouragement that higher [T.
The high transconductance of the HEMT is the result of confining a substantial fraction of the conduction electrons into a two dimensional electron gas near the heterojunction.
We have recently calculated the non-zero Lorentzian type force of a current in a wire on a stationary charge outside the wire by using conduction electrons all having the same speed [3].
The hybrid nature of surface plasmons (which emerge from the coupling of photons to the collective oscillations of conduction electrons in metals) has allowed an unprecedented control of light at the nanoscale, a regime inaccessible to standard photonic technology.
When nanostructures, such as nanorods, of certain metals are exposed to visible light, the conduction electrons of the metal can be caused to oscillate collectively, absorbing a great deal of the light.
Other theorists countered that the spins of conduction electrons are usually randomly oriented, with every up spin canceled by a down spin.
Since the device must fully recover to its original nonconductive state before the next light pulse can be resolved, the diode's detection speed depends on how quickly the conduction electrons can be swept from the silicon film.
Au(III)-Pt(III) or Cu(III)-Ni(III) ) will be chosen in order to put into evidence the role of the paramagnetic centres and their possible interplay with conduction electrons.
The spin polarization of the conduction electrons due to Andreev reflection at ferromagnetic/superconductor interface could be determined through the following equation as: