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 ?
Substituting the operator representation of the impurity and conduction electron spins and considering that, the local Kondo spin singlets (s bosons) and local Kondo spin triplets ([t.
e](x) is the local conduction electron density and [[bar.
The surface resistance is inversely proportional to the conduction electrons present in the surface region, ns i.
Now, any photons that make it into the insulating substrate can no longer produce conduction electrons, so the diode's speed stays optimal for all wavelengths.
A careful selection of appropriated systems with these type of metal complexes is expected lead to new materials with unconventional electrical and magnetic properties and its study can provide illuminating conclusions on the structure properties relationships and can put in evidence the role of the localised magnetic moments and its interaction with delocalised conduction electrons in molecular solids.
The spin polarization of the conduction electrons due to Andreev reflection at ferromagnetic/superconductor interface could be determined through the following equation as:
By processing the polymer so that millions of chains line up side by side, the Ohio team and others can make materials in which conduction electrons can almost always avoid dead-ends by hopping to adjacent chains.
Instead of having many conduction electrons as in a metal, the ceramics appears to have very few -- a meaty paradox for superconductor theorists to demystify.
What leads to superconductivity, despite the repulsion between conduction electrons, is an effective attractive interaction between those holes as they move around," Goddard says.
Ordinary metals have such conduction electrons in great abundance, but the new superconducting materials are ceramics with far fewer free electrons in them.
In that case, valence electrons, the electrons that bind the atoms together in the crystal (which are not the same as the conduction electrons that form electric currents) jump from one atom to another, causing force distortions that bind the conduction electrons in pairs.
Currents are ordinarily provided by the conduction electrons, which are so loosely bound that they cannot be assigned to particular atoms but are free to drift long distances through the metal.