The local symmetry of dislocation centers in monocrystals was studied by monitoring the spatially resolved photoluminescence of individual screw dislocations. A limited set of dislocation Cs centers (2 from a total of 6) was found to be characteristic of each screw dislocation. That set determined the asymmetry of the core structure. Spatial and temporal non-stationarities of the dislocation domains, as observed in the polarized emission of dislocations, were explained in terms of the reorientation of one-dimensionally ordered Cs centers in the core of screw dislocation which glided via the Peierls mechanism.

V.D.Negrii: Journal of Applied Physics, 1993, 74[11], 7008-10