small polaron

small polaron

[′smȯl ′pō·lə‚rän]
(solid-state physics)
A quasiparticle comprising a self-trapped electronic charge localized within a small region of a solid of spatial extent comparable to an interatomic dimension, and the atomic displacement pattern which produces the potential well within which the charge is bound.
References in periodicals archive ?
Small polaron hopping (SPH) model: In the SPH model, the exponent s increases with increasing temperature [24, 33].
2] minerals, where the hole also behaves as a small polaron [42].
The lower of the two values is related to hopping of small polarons [43].
There are various theoretical models such as small polaron tunneling (s increases with temperature), electron tunneling (s is independent of temperature), and CBH model (s decreases with temperature) that can provide explanation for ac conductivity [3, 4, 12, 13, 24, 26, 27].
The typical semiconductor behavior at T> Tc can be reasonably well fitted to a nonadiabatic small polaron hopping model.
s] is the activation energy for TEP, [alpha] is a constant and [alpha] < 1 suggests that the conductivity is small polaron hopping, whereas for [alpha] > 2, conductivity is due to large polarons, and k is the Boltzmann constant.
The presence of small polarons is probable in solid materials with narrow conducting bands and large coupling constant [17].
Full browser ?