Autor: Rudziński, W. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Tunnel Magnetoresistance for Phonon-Assisted Tunneling through Quantum Dots
Autorzy:: Rudziński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1813937.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.63.Kv
73.23.Hk
Opis:: Spin-polarized transport through a single-level quantum dot interacting with a local phonon mode is studied in the frame of the nonequilibrium Green-function technique. It is shown that strong electron-phonon interaction gives rise to a significant current suppression, to additional resonance peaks in the differential conductance as well as to oscillations of the tunnel magnetoresistance. Also, a phonon-induced mechanism leading to a minimum in tunnel magnetoresistance at zero bias voltage is explained.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 587-590
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Spin-Flip Transitions in Tunneling through a Quantum Dot Coupled to Ferromagnetic Electrodes
Autorzy:: Rudziński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1810526.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.63.Kv
73.23.Hk
Opis:: Using nonequilibrium Green function formalism the spin-polarized electronic transport through a quantum dot coupled to ferromagnetic electrodes is studied. Arbitrary Coulomb correlations and spin-flip processes are considered in the dot, for both parallel and antiparallel magnetic configurations of the junction. It is found that spin-flip processes suppress the magnetoresistance between each pair of the threshold bias voltages, thus giving rise to sharp tunnel magnetoresistance maxima at the thresholds. The origin of additional steps in the electric current, splitting of the resonance peaks in the corresponding differential conductance as well as negative differential conductance is also discussed in the context of interplay between tunneling processes and the intradot spin-flip transitions.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 281-283
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Andreev Reflection in Transport Through a Quantum Dot Interacting With a Polaron
Autorzy:: Bocian, K.
Rudziński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1202075.pdf
Data publikacji:: 2014-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.23.Hk
73.63.Kv
74.25.F-
Opis:: Spin-dependent tunneling through a quantum dot coupled to one ferromagnetic and one superconducting electrodes is studied theoretically in the Andreev reflection (AR) regime. Spectral functions for the system are calculated in terms of the nonequilibrium Green function technique. Effects due to interplay between the Coulomb correlations on the dot and the local phonon mode in the context of the AR transmission are analyzed.
Źródło:: Acta Physica Polonica A; 2014, 126, 1; 374-375
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Phonon-Assisted Electronic Transport through Double Quantum Dot System Coupled to Ferromagnetic Leads
Autorzy:: Trocha, P.
Rudziński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1399105.pdf
Data publikacji:: 2013-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.23.Hk
73.63.Kv
Opis:: Phonon-assisted electronic tunneling is studied through a double quantum dot coupled in parallel to ferromagnetic electrodes. The current-voltage characteristics for the system are derived within the nonequilibrium Green function technique based on equation of motion. It is found that additional phonon-induced resonance peaks appear in the spectral function on both sides of the main resonances corresponding to the quantum dot energy levels. It is shown that the "molecular-like" resonances are reproduced in the phonon side bands in the differential conductance. A significant phonon-induced enhancement of tunnel magnetoresistance as well as tunnel magnetoresistance oscillations are also predicted.
Źródło:: Acta Physica Polonica A; 2013, 124, 5; 843-845
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Thermoelectric Effect in Photon-Assisted, Spin-Polarized Tunnelling through a Quantum Dot
Autorzy:: Bocian, K.
Rudziński, W.
Powiązania:: https://bibliotekanauki.pl/articles/1386730.pdf
Data publikacji:: 2015-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.23.Hk
73.63.Kv
74.25.F-
Opis:: Features of electric and thermal conductance, Seebeck coefficient as well as figure of merit in tunnelling through a single level quantum dot connected to external ferromagnetic leads are investigated theoretically using the equation of motion method within the nonequilibrium Green function technique. The influence of the harmonic ac field on the transport characteristics for the considered system is discussed in detail. In particular, it is shown that the photonic field strongly modulates the Seebeck coefficient, thus resulting in multi-peak structure of figure of merit. Thermoelectric phenomenon in a hybrid junction with the dot attached to two ferromagnetic and one superconducting lead is also discussed.
Źródło:: Acta Physica Polonica A; 2015, 127, 2; 484-486
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Andreev Reflection in Transport through a Quantum Dot Coupled to Ferromagnetic and Superconducting Electrodes
Autorzy:: Bocian, K.
Rudziński, W.
Barnaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/1427585.pdf
Data publikacji:: 2012-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Mk
73.63.Kv
73.23.Hk
Opis:: Spin-dependent tunneling through a quantum dot coupled to one ferromagnetic and one superconducting electrodes is studied theoretically in the Andreev reflection regime. Electrical conductance is calculated in terms of the nonequilibrium Green function technique. Effects due to the Zeeman splitting of the dot level are analyzed in both linear and nonlinear transport regimes, and are compared with the corresponding effects due to coherent intradot spin rotation.
Źródło:: Acta Physica Polonica A; 2012, 121, 5-6; 1201-1203
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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