Polaron
A composite quasiparticle consisting of a conduction electron (or hole) bound together with its surrounding self-induced lattice polarization distortion cloud in an ionic crystal.
Governing formula
m*_polaron = m* (1 + α_coupling / 6)
SI unit
Quasiparticle Mass
In depth
As a charged electron moves through an ionic crystal lattice, it repels negative ions and attracts positive ions, creating a localized polarization potential well that moves with the electron, increasing its effective mass m*.
Examples in the real world
Polaron charge transport in transition metal oxide materials and organic conducting polymers.