Polaron


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Polaron

The object that results when an electron in the conduction band of a crystalline insulator or semiconductor polarizes or otherwise deforms the lattice in its vicinity. The polaron comprises the electron plus its surrounding lattice deformation. (Polarons can also be formed from holes in the valence band.) If the deformation extends over many lattice sites, the polaron is “large,” and the lattice can be treated as a continuum. Charge carriers inducing strongly localized lattice distortions form “small” polarons. See Band theory of solids, Hole states in solids, Semiconductor

Polaron

 

an electron moving through a crystal together with the lattice distortion caused by the electron. The concept was introduced by the Soviet physicist S. I. Pekar. The polaron is a compound quasiparticle and consists of the electron with its associated phonons. The introduction of the polaron permits certain properties of dielectrics and semiconductors to be explained.

polaron

[′pō·lə‚rän]
(solid-state physics)
An electron in a crystal lattice together with a cloud of phonons that result from the deformation of the lattice produced by the interaction of the electron with ions or atoms in the lattice.
References in periodicals archive ?
Adjustable conductivity, high thermal stability and polaron hopping mechanism compatible with the CBH model of PTh/[Co.
conductivity changing to the relation [sigma] indicate the increase of conductivity due to the increasing polarons concentration, value of exponent S was found and values was in range (0.
The Benzenoid / quinoid band is assigned to p-p* electron transition and the band at 430 nm is assigned to low wavelength polaron band, it did not change considerably with the concentration of polyaniline in the composite [40].
Small polaron hopping (SPH) model: In the SPH model, the exponent s increases with increasing temperature [24, 33].
To facilitate the development of this new business, a wholly-owned subsidiary of ZMFY, Yu Sheng Investments Limited has entered into a MOU with Polaron Solartech in relation to the proposed subscription of a 49% shareholding interest in Polaron Solartech on 8 May 2014.
An absorption band of the polymer at 298 nm corresponds to valance band to conduction band and a shoulder around 350 nm is due to polaron level to [[pi].
Among the topics are optical properties of nanostructured metamaterials, magnetic second-harmonic generation from interfaces and nanostructures, reflection anisotropy spectroscopy studies of thiolate/metal interfaces, the decisive role of interface phonons in polaron state formation in quantum nanostructures, and towards the ab initio calculation of the circular dichroism of peptides.
Here, the absorption peak at 280 nm is attributed to [pi] - [pi] * transition of benzene ring; at 390 nm to the transition absorption of polaron to [pi] *, and the tail peak at 800 nm corresponds to the absorption of polaron after being doped by proton.
A polaron is an excitation caused by a polarized electron traveling through a material together with the resultant polarization of adjacent dipoles and lattice distortion (4).