Role of Correlation and Exchange for Quasi-particle Spectra of Magnetic and Diluted Magnetic Semiconductors
arXiv:cond-mat/0403266 · doi:10.1016/j.physb.2004.11.071
Abstract
Theoretical foundation and application of the generalized spin-fermion (sp-d) exchange lattice model to magnetic and diluted magnetic semiconductors are discussed. The capabilities of the model to describe spin quasi-particle spectra are investigated. The main emphasis is made on the dynamic behavior of two interacting subsystems, the localized spins and spin density of itinerant carriers. A nonperturbative many-body approach, the Irreducible Green Functions (IGF) method, is used to describe the quasi-particle dynamics. Scattering states are investigated and three branches of magnetic excitations are calculated in the regime, characteristic of a magnetic semiconductor. For a simplified version of the model (Kondo lattice model) we study the spectra of quasi-particle excitations with special attention given to diluted magnetic semiconductors. For this, to include the effects of disorder, modified mean fields are determined self-consistently. The role of the Coulomb correlation and exchange is clarified by comparing of both the cases.
arXiv comment34 pages
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- Statistical Theory of Spin Relaxation and Diffusion in Solids
- Bogoliubov's Quasiaverages, Broken Symmetry and Quantum Statistical Physics
- Physics of Complex Magnetic Materials: Quasiparticle Many-Body Dynamics
- Electronic Dynamics of the Anderson Model. The Many-Body Approach