Conduction Electron


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conduction electron

[kən′dək·shən i′lek‚trän]
(solid-state physics)
An electron in the conduction band of a solid, where it is free to move under the influence of an electric field. Also known as outer-shell electron; valence electron.

Electron, Conduction

 

an electron in metals and semiconductors whose energy lies in a partially filled energy band (the conduction band; seeSOLID). At a temperature of absolute zero there are no electrons in the conduction band of dielectrics and semiconductors. Electrons appear with increased temperature, upon illumination and the introduction of impurities, and under the influence of other external influences.

Conduction electrons always exist in metals, where their concentration is high. When T = 0°K, conduction electrons in metals occupy all the states having energies less than the Fermi energy. It is convenient to describe their characteristics in terms of the kinetic theory of gases by utilizing the concepts of mean free path and frequency of collisions, among others. In semiconductors, where the number of conduction electrons is relatively small, the gas is well described by the classical Boltzmann statistics. In metals, the conduction electrons form a degenerate Fermi liquid.

References in periodicals archive ?
* Response of conduction electrons: From the concept of single electrons moving against a background lattice of positive ion cores we can describe many of the fundamental electronic properties of the solid state.
We are going to use such pairs of charges--specifically a conduction electron (-e), and its partner, the nearest stationary proton (e)--in a current carrying wire and investigate the non vanishing field in lab produced by such pairs outside the wire.
where [C.sup.+.sub.k[sigma]]([C.sub.k[sigma]]) and [f.sup.+.sub.k[sigma]] ([f.sub.k[sigma]]) are the creation (annihilation) operator of conduction electron and f-electron.
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.
"Heavy-fermion compounds" are materials in which the conduction electrons move as if they were hundreds of times more massive than those in conventional metals.
This region therefore is depleted of conduction electrons and the surface resistivity of the grain increases.
In graphene, on the other hand, conduction electrons tend to move in lockstep as a single quantum entity.
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.
The reduction in magnetic domain arrangement leads to reduced interaction between conduction electrons and magnons, causing a decrease in the temperature coefficient of electrical resistivity.