Interplay between the exchange and Coulomb interactions in a ferromagnetic semiconductor quantum dot

摘要: We study the effects of strong $sp\text{\ensuremath{-}}d$ exchange interaction, ferromagnetic ordering, and large spin fluctuations on quantum transport in a semiconductor dot (FSQD) coupled to nonmagnetic current leads. The retarded Green's function for FSQD Coulomb blockade regime is calculated using simple equation motion technique. level broadening due interaction between charge carrier spins localized magnetic moments atoms considered within self-consistent Born approximation. also calculate giant Zeeman splitting levels, conductance, accumulation dot. model predicts spin-disorder scattering, especially at temperatures close ordering temperature. Our main finding that small with intradot repulsion unusual temperature field dependences give rise conductance behavior, which similar Kondo resonance QDs, even when higher order correlations leads are neglected.