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2 Materials Science Poland

2 2007

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Interference and Coulomb correlation effects in spin-polarized transport through coupled quantum dots

Trocha P., Barnaś J.

Materials Science Poland

2007

Vol. 25, No. 2

545--552

Spin-dependent transport through two coupled single-level quantum dots attached to ferromagnetic leads with collinear (parallel and antiparallel) magnetizations is analyzed theoretically. The intra-dot Coulomb correlation is taken into account, whereas the inter-dot Coulomb repulsion is neglected. Transport characteristics, including conductance and tunnel magnetoresistance associated with the magnetization rotation from parallel to antiparallel configurations, are calculated by the noneqiulibrium Green function technique. The relevant Green functions are derived by the equation of motion method in the Hartree-Fock approximation. We have found a splitting of the Fano peak, induced by the intra-dot Coulomb interaction. Apart from this, the intra-dot electron correlations are shown to lead to an enhancement of the tunnel magnetoresistance effect.

Aharonov-Bohm interferometry with the T-shaped capacitively coupled quantum dots in the orbital Kondo regime

Krychowski D., Lipiński S.

Materials Science Poland

2007

Vol. 25, No. 2

435--439

The magnetic field dependence of coherent transport through a pair of wires attached to two Aharonov-Bohm rings with embedded double dots is considered. The double dots are electrostatically coupled. The many-body problem is studied within the mean field slave boson approach and complementarily by the method of equation of motion in the limit of infinite intra and finite or infinite interdot Coulomb interactions.