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Wyszukujesz frazę "Świrkowicz, M." wg kryterium: Autor

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    Tytuł:
    Nonequilibrium Kondo Effect in a Single-Channel Quantum Dot Asymmetrically Coupled to Two Ferromagnetic Reservoirs
    Autorzy:
    Świrkowicz, R.
    Wilczyński, M.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037118.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Hr
    72.15.Qm
    72.25.-b
    73.23.Hk
    Opis:
    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.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 149-154
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Torque in Double Planar Tunnel Junctions
    Autorzy:
    Wilczyński, M.
    Świrkowicz, R.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810520.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    72.25.-b
    Opis:
    Transport in a double planar tunnel junction with ferromagnetic electrodes is analyzed theoretically in the zero-temperature limit. The in-plane and out-of-plane components of the spin torque exerted on magnetic moment of the central layer are determined as a function of the angle θ between magnetic moments of one of the external electrodes and of the central layer. Two configurations of the magnetic moments of external electrodes are considered, i.e. parallel and antiparallel ones. It is found that both torque components depend strongly on the thickness of the central layer, especially in junctions with a relatively thin central layer, where enhancement of the torque or a change of its sign can be observed for specific layer thicknesses. In junctions with thick central layer and in the limit of small bias voltage applied to the junction, the in-plane torque is generally smaller in the parallel configuration than in the antiparallel one. The opposite relation is observed for the normal torque.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 269-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon-Assisted Kondo Resonance in Spin-Dependent Transport through a Quantum Dot
    Autorzy:
    Świrkowicz, R.
    Wilczyński, M.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810522.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.Hk
    73.63.Kv
    73.43.Qt
    72.25.-b
    Opis:
    Effects of local vibrational modes on electron transport through a quantum dot attached to ferromagnetic electrodes are studied in the Kondo regime by the non-equilibrium Green function formalism based on the equation of motion method. Differential conductance is calculated for parallel and antiparallel configurations of the leads' magnetic moments, and well defined Kondo resonance peaks and their phonon satellites are found. The influence of a compensating magnetic field on the peak positions is also discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 272-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Poor Mans Scaling and Green Function Analysis of the Kondo Anomaly in Single-Level Quantum Dots
    Autorzy:
    Wawrzyniak, M.
    Świrkowicz, R.
    Wilczyński, M.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813883.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Hr
    72.15.Qm
    72.25.-b
    73.23.Hk
    Opis:
    Kondo effect in a single-level quantum dot attached to magnetic leads is studied theoretically by the "poor man's scaling" and non-equilibrium Green function methods. From the scaling equations we derive the Kondo temperature as a function of the model parameters - in particular as a function of the angle between magnetic moments. Transport characteristics, i.e. differential conductance and tunnel magnetoresistance associated with magnetization rotation, were calculated within the non-equilibrium Green function formalism based on the equation of motion method.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 553-556
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Polarized Transport through Quantum Dots: Coulomb Blockade and Kondo Effect
    Autorzy:
    Barnaś, J.
    Świrkowicz, R.
    Wilczyński, M.
    Weymann, I.
    Martinek, J.
    Dugaev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036886.pdf
    Data publikacji:
    2003-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.-b
    73.23.Hk
    72.15.Qm
    Opis:
    Spin related effects in electronic transport through quantum dots, coupled via tunneling barriers to two metallic leads, are discussed from the point of view of fundamental physics and possible applications in spin electronics. The effects follow either from long spin relaxation time in the dots or from spin dependent tunneling through the barriers when the external leads are ferromagnetic. In the former case large nonequilibrium spin fluctuations in the dot can be induced by flowing current. These fluctuations modify transport characteristics, particularly the shape of the Coulomb steps. In the latter case electric current depends on magnetic configuration of the system, and tunnel magnetoresistance effect due to magnetization rotation can occur. Transport properties in the weak coupling regime are described perturbatively in the first (sequential) and second (cotunneling) orders. In the strong coupling regime, on the other hand, the equation of motion for nonequilibrium Green functions is used to calculate electric current at low temperatures, where the Kondo peak in conductance is formed in the zero bias regime. In symmetrical systems the Kondo peak is split in the parallel magnetic configuration, whereas no splitting occurs for the antiparallel alignment. Theoretical results are discussed in view of available experimental data.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 2; 165-177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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