Modified equation of motion approach for metallic ferromagnetic systems with the correlated hopping interaction

作者：Gorski Grzegorz^*; Mizia Jerzy; Kucab Krzysztof

来源：Physica Status Solidi (B) Basic Research, 2016, 253(6): 1202-1209.

DOI：10.1002/pssb.201552722

• Abrikosov-Suhl resonance
• Anderson model
• correlated hopping
• equation of motion
• ferromagnetism

We consider the extended Hubbard model with included nearest neighbors off-diagonal correlated hopping interaction. This model is analyzed using the modified equation of motion (EOM) approach with double-time Green's functions. In modified EOM method we calculate the retarded Green's function of the impurity by differentiating Green's functions over both time variables. The proposed model is used to investigate possibility of ferromagnetism in the itinerant system. We calculate the Curie temperature for different carrier concentrations, state densities with different asymmetry, different values of the Coulomb interaction and correlated hopping interaction. Results of our relatively simple method are compared and agree with the results of previous Quantum Monte Carlo and Modified Perturbation Theory calculations. This legitimates further use of this model in different physical applications, e.g., quantum dots.

• 出版日期2016-6