polaron
/ˈpəʊlərɒn/Physics
noun
A quasiparticle in a crystal consisting of a free electron together with an associated distortion of the crystal lattice, the distortion resulting from the interaction of the electron with the constituent ions or atoms of the lattice.
Origin
1940s. From polar- + -on, after Russian poljaron from poljar- (in poljarnyj polar) + -on.