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- K. Zberecki, Renata Swirkowicz, MichaÅ‚ Wierzbicki, J. Barnas
- Physical chemistry chemical physics : PCCP
- 2014

Using ab initio methods we calculate thermoelectric and spin thermoelectric properties of silicene nanoribbons with bare, mono-hydrogenated and di-hydrogenated edges. Asymmetric structures, in which one edge is either bare or di-hydrogenated while the other edge is mono-hydrogenated (0H-1H and 2H-1H nanoribbons), have a ferromagnetic ground state andâ€¦ (More)

Transport in a single planar tunnel junction with electrodes made of a ferromagnetic semiconductor is analyzed theoretically in the zero-temperature limit. Tunneling current and both (in-plane and out-of-plane) components of the spin torque exerted on one of the ferromagnetic electrodes are determined as a function of the angle Î¸ between magnetic moments ofâ€¦ (More)

- P Ogrodnik, Maciej WilczyÅ„ski, J. Barnas, Renata Swirkowicz
- IEEE Transactions on Magnetics
- 2011

We present the results on current-induced magnetic dynamics in a single magnetic tunnel junction consisting of a thick magnetic layer separated by a tunnel barrier from a thin free magnetic layer. Both in-plane and out-of-plane torque components have been taken into account and both turned out to be important for description of magnetic switching andâ€¦ (More)

- D. Sztenkiel, Renata Swirkowicz
- Journal of physics. Condensed matter : anâ€¦
- 2007

Electron transport through a double quantum dot system is studied with the use of the Green function formalism based on the equation of motion method, and an interplay between interference and Coulomb blockade effects due to inter-dot correlations is discussed. A double structure with two Fano resonances (or antiresonances) is found in the conductanceâ€¦ (More)

Thermoelectric properties of silicene nanoribbons doped with magnetic impurity atoms are investigated theoretically for both antiparallel and parallel orientations of the edge magnetic moments. Spin density distribution and transport parameters have been determined by ab-initio numerical methods based on the density functional theory. Doping with magneticâ€¦ (More)

- K. Zberecki, MichaÅ‚ Wierzbicki, Renata Swirkowicz, J. Barnas
- Journal of physics. Condensed matter : anâ€¦
- 2017

We analyze magnetic, transport and thermoelectric properties of narrow carbon polymers, which are chemically functionalized with nitroxide groups. Numerical calculations of the electronic band structure and the corresponding transmission function are based on density functional theory. Transport and thermoelectric parameters are calculated in the linearâ€¦ (More)

Electron transport across two capacitively coupled quantum dots in a parallel geometry is theoretically studied in the non-linear response regime with spin and orbital degrees of freedom taken into account and the Kondo effect induced by on-site and inter-dot Coulomb correlations is analyzed. For a system with each dot symmetrically coupled to a separateâ€¦ (More)

- MichaÅ‚ Wierzbicki, Renata Swirkowicz
- Journal of physics. Condensed matter : anâ€¦
- 2010

Electron and energy transport through a two-level molecule (quantum dot) with intra-Â and inter-level Coulomb correlations is studied using the non-equilibrium Green function formalism. Thermoelectric coefficients are determined in the regime of linear transport for a wide range of gate voltages and temperature. At low temperatures Coulomb blockade effectsâ€¦ (More)

- MichaÅ‚ Wierzbicki, J. Barnas, Renata Swirkowicz
- Journal of physics. Condensed matter : anâ€¦
- 2015

The effects of electron-electron and spin-orbit interactions on the ground-state magnetic configuration and on the corresponding thermoelectric and spin thermoelectric properties in zigzag nanoribbons of two-dimensional hexagonal crystals are analysed theoretically. The thermoelectric properties of quasi-stable magnetic states are also considered. Ofâ€¦ (More)

- K. Zberecki, Renata Swirkowicz, MichaÅ‚ Wierzbicki, J. Barnas
- Physical chemistry chemical physics : PCCP
- 2016

We analyze theoretically the transport and thermoelectric properties of graphene nanoribbons of a specific geometry, which have been synthesized recently from polymers [Cai, et al., Nature, 2011, 466, 470]. When such nanoribbons are modified at one of the two edges by Al or N substitutions, they acquire a ferromagnetic moment localized at the modified edge.â€¦ (More)