INTRINSIC DEFECTS IN DENSITY WAVES

We present new results on properties to topological defects in Density Wave crystals. For an isolated point - ( a 2pi - soliton) and for a l ine - (a dislocation) defects the Coulomb interactions dominates in de termining distributions of the phase phi, the potential PHI and of the accompanying electronic structure. The last shows itself e.g. in a co llapse of the density wave gap over a large number of chains around a dislocation. In spin density wave conventional dislocations loose thei r priority in favor of special topological objects: half - integer dis locations combined with a semi - vortex of a staggered magnetization v ector.