Nonequilibrium Kondo Effect in a Single-Channel Quantum Dot Asymmetrically Coupled to Two Ferromagnetic Reservoirs
R. Świrkowicz a , M. Wilczyński a and J. Barnaś b
a Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland
b Department of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland and Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
Full Text PDF
Nonequilibrium Kondo effect in a quantum dot asymmetrically coupled to two ferromagnetic metallic leads is analyzed theoretically. The nonequilibrium Green function technique is used to calculate density of states and electric current. The lesser and retarded (advanced) Green functions are calculated by the equation of motion method within a consistent approximation scheme. The case where one electrode is half-metallic is analyzed numerically in details.
DOI: 10.12693/APhysPolA.105.149
PACS numbers: 75.20.Hr, 72.15.Qm, 72.25.--b, 73.23.Hk