Near core effects of misfit dislocations at epitaxial interfaces

Based on the recent weak beam studies of misfit dislocations at a Si/Ge_xSi_1-x interface, it was determined that the extent of elastic distortions was delocalized to a significant extent compared with the bulk lattice dislocation. This delocalization of the core was characterized as a feature unique to the properties of the interface such as lattice mismatch and lattice bonding across the interface. In this study we propose to develop a model to capture the physical features of the misfit dislocation core which allows one to bypass the difficulties associated with the non-linearities of core. The concept of this model rests on the utilization of eigenstrain formalisms as has been developed by Eshelby.