Spin-polarized half-metallic state of a ferromagnetic delta layer embedded in a semiconducting matrix
I discuss a model to describe the occurrence of a spin-polarized half-metallic state around a delta layer of magnetic transition metal atoms embedded into a non-magnetic semiconducting matrix. The intrinsic physical properties of a single delta layer are responsible for ferromagnetic order in this system. The relevant physical ingredients of the model are the hybridization of the d electron states of the transition metal with the (s,p) electron states of the semiconductor, the charge redistribution around the delta layer, and the electron-electron correlation on the d orbitals of the transition metal atoms, which is the driving force of ferromagnetism. The seminar is preceded by a tutorial introduction to the formalism of second quantization for Fermi systems.
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