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Strong electronic correlations in CePt4In

Pikul A, Kaczorowski D

Materials Science Poland

2008

Vol. 26, No. 4

822--830

Polycrystalline samples of CePt4In and LaPt4In were studied by means of X-ray powder diffraction, magnetic susceptibility, electrical resistivity and specific heat measurements. Some of the results have been compared to those reported previously for single-crystalline specimens. The physical properties of CePt4In indicate that the magnetic moments of cerium are rather well localized and contribute to the Kondo-type scattering of conduction electrons in the presence of strong crystalline electric field.

Orbital Kondo anomaly and channel mixing effects in a double quantum dot

Sztenkiel D., Świrkowicz R.

Materials Science Poland

2008

Vol. 26, No. 3

699--706

A system consisting of two quantum dots connected to separate reservoirs is studied and electron transport properties are investigated in the Kondo regime with use of the non-equilibrium Green function technique based on the method of equation of motion. As the orbital quantum number is conserved during tunnelling processes when each dot is attached to its own leads, the orbital SU(2) Kondo effect is observed. It is shown that the mixing between the leads strongly modifies transport properties leading to a considerable suppression of the Kondo resonance.

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.

Spin and orbital Kondo effect in electrostatically coupled quantum dots

Lipiński S.

Materials Science Poland

2006

Vol. 24, No. 3

689--693

The spin polarization of conductance of the system of two capacitively coupled quantum dots is studied in the Kondo regime by the equation of motion method. For the case of orbital degeneracy in the one spin channel the system can operate as a spin filter.

Spin-dependent transport through a double dot system

Lipiński S., Bułka B. R., Krychowski D.

Materials Science Poland

2004

Vol. 22, No. 4

513--522

The coherent transport through a set of two capacitively coupled quantum dots placed in a magnetic field and coupled to ferromagnetic electrodes is considered in the limit of infinite intra- and interdot interactions. The densities of states are calculated in an approximation that favours separate fluctuations of spin, orbital isospin, and simultaneous fluctuations of both of them. Apart from the Kondo peak, satellite many-body peaks are also found in the densities of states. Their positions and weights depend on the magnetic field and polarization of electrodes. This is reflected in the spin dependence of conductance remarkably varying for the voltage bias corresponding to the peak positions.