Intrinsic defects in density waves

Abstract
We present new results on properties of topological defects in Density Wave crystals. For an isolated point - (a 2π - soliton) and for a line - (a dislocation) defects the Coulomb interaction dominates in determining distributions of the phase φ, the potential Φ and of the accompanying electronic structure. The last shows itself e.g. in a collapse of the density wave gap over a large number of chains around a dislocation. In spin density wave conventional dislocations loose their priority in favor of special topological objects : half - integer dislocations combined with a semi - vortex of a staggered magnetization vector.