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 ?
e](x) is the local conduction electron density and [[bar.
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.
x,i] of a conduction electron is less than 2 x [10.
e](x) (not to be confused with the variable conduction electron density [N.
c] to estimate the effect of the field of conduction electrons at the position of a test charge Q.
The rate of change in conductivity is then proportional to the rate of change in conduction electrons as given by:
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.
where [GAMMA][up arrow] (E) and [GAMMA][down arrow](E) are the tunneling probabilities of conduction electrons with up-spin and down-spin respectively.
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.
The phonons have reached an optimum value, where, instead of impeding the conduction electrons, they induce them to form pairs with oppositely directed spins.
In the usual case, Ueda points out, physicists would expect the spins of the rare-earth ions to interact with the spins of the conduction electrons by a mechanism called the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, which leads to a magnetic state at extremely low temperatures.
As Steglich puts it, the interaction between these f band electrons and the conduction electrons "heavily dresses' the conduction electrons so that they move sluggishly, as if they were much heavier than they actually are.