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    Wyświetlanie 1-7 z 7
    Tytuł:
    Tunneling through the Quantum Dot Coupled to Incoherent Superconductor
    Autorzy:
    Donabidowicz, A.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047329.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    74.20.Fg
    74.45.+c
    Opis:
    We study the equilibrium and non-equilibrium properties of the strongly correlated quantum dot coupled between normal and superconducting leads. The effect of electron pair coherence, Coulomb interactions, and d-wave anisotropy of the order parameter are discussed with a particular account of their influence on a charge tunneling through the quantum dot.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 671-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Effect in the Normal Conductor-Superconductor Junction: A BTK Approach
    Autorzy:
    Wysokiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418323.pdf
    Data publikacji:
    2012-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    74.25.fg
    73.23.Ad
    Opis:
    The thermopower of the junction between normal conductor and s-wave superconductor has been investigated. For this purpose we have analyzed in detail a simple generalization of the Blonder-Tinkham-Klapwijk theory by taking into account explicitly an energy dependence of the density of states near the Fermi level. Both linear and nonlinear thermopowers have been calculated for 3D free electron gas, 3D Fermi liquid, and the case with Van Hove singularity in the vicinity of the Fermi level. In the linear regime, for all models, the thermopower as function of temperature has a clear maximum with its position and the value depending strongly on the junction barrier strength. In the nonlinear regime, we have found very large values of the thermopower (up to 8 $k_{B}$/e) and strongly asymmetric behavior with respect to the change of the temperature gradient sign.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 4; 758-764
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling Charge Transport in Graphene-Based Superconductor Junctions
    Autorzy:
    Wojciechowski, R.
    Kowalewski, L.
    Nogala, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1427098.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    72.80.Vp
    72.25.-b
    Opis:
    We study the spin polarized electron and hole tunneling transport through a graphene-based ferromagnet$(GF_1)$-insulator$(GI_1)$-superconductor$(G_{S})$-insulator$(GI_2)$-ferromagnet$(GF_2)$ junction. Proximity induced spin polarization and superconductivity in a graphene sheet are assumed to be created by superconducting and ferromagnetic electrodes placed on the top of the graphene. Using a four-dimensional version of the Dirac-Bogoliubov-de Gennes equation with appropriate boundary conditions we investigate the tunneling processes through the junctions. In particular, we present calculations of the amplitudes of normal and Andreev reflections as a function of the energy of the incident electron for a wide range of the model parameters, such as the strength and orientation of the exchange field, the barrier strength, and the distance between the two ferromagnetic layers. The tunneling transport processes in the graphene-based double junction GF/GI/$G_{S}$/GI/GF are compared with those in non-graphene-based junctions.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1092-1094
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Dependent Electron Tunneling in a Ferromagnet Superconductor Ferromagnet Junction
    Autorzy:
    Kowalewski, L.
    Wojciechowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810509.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    74.50.+r
    73.23.Ad
    Opis:
    The coherent spin polarized transport in ferromagnet/superconductor/ferromagnet double barrier junctions is analyzed. Using the Bogolubov-de Gennes equation with appropriate boundary conditions, we calculate probabilities of spin dependent transport processes in the ferromagnet/superconductor/ferromagnet junction. In particular, we discuss the nonlocal processes such as the crossed Andreev reflection and elastic co-tunneling. These processes contribute to tunneling a current when the distance between the two magnetic electrodes is comparable to the superconducting coherence length. The dependences of the tunneling transport processes on the strength of the exchange field in the ferromagnetic electrodes, and on the height of the tunnel barriers are presented.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 257-259
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The In-Gap Charge Current through the Correlated Quantum Dot Hybridized with Superconductor
    Autorzy:
    Donabidowicz, A.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812275.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    74.20.Fg
    74.45.+c
    Opis:
    We explore the Andreev tunnelling through the strongly correlated quantum dot embedded between the normal and superconducting electrodes. For a small external voltage |eV| <$∆_s$ the electron arriving from the normal lead can be converted into a pair on the quantum dot and further propagates in the superconducting lead while simultaneously the hole is reflected back to the normal electrode. Conductance of such anomalous current is very sensitive to the particle-hole mixing of the quantum dot spectrum. We analyze the influence of the proximity effect and the Coulomb interactions on the differential Andreev conductance focusing on the extreme limit $∆_s$ → ∞.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 75-82
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Superconductor/Photosemiconductor Contact Structures in Electronics
    Autorzy:
    Bunda, V.
    Bunda, S.
    Komanicky, V.
    Botko, M.
    Čižmár, E.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1202071.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    74.78.-w
    85.25.Hv
    Opis:
    In recent years, two-dimensional (2D) nanostructured materials, such as nanoplates and nanosheets, have attracted much attention because of their unique electronic, magnetic, optical, and catalytic properties, which mainly arise from their large surface areas, nearly perfect crystallinity, structural anisotropy, and quantum confinement effects in the thickness. The 2D nanostructured materials can be used as building blocks for advanced materials and devices with designed functions in areas as diverse, as lasers, transistors, catalysis, solar cells, light emission diodes, chemical and biological sensors. We report physical properties of YBCO/BiOI contact structures and electrophysical properties of BiOI single crystal.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 362-363
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermoelectric Transport through a Quantum Dot Coupled to a Normal Metal and BCS Superconductor
    Autorzy:
    Krawiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812283.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.-b
    73.50.Lw
    72.15.Qm
    74.45.+c
    Opis:
    We discuss thermoelectric properties of a quantum dot coupled to one normal and one superconducting lead in the presence of the Kondo effect and the Andreev scattering. We will focus on conductance, thermal conductance, thermopower and related quantities like thermoelectric figure of merit which is a direct measure of the usefulness of the system for applications and the Wiedemann-Franz ratio which indicates if the system is in the Fermi liquid state. We will show that the superconductivity strongly modifies the thermal properties of the system. In particular, the thermopower is strongly enhanced near the superconducting transition temperature. Moreover, the Andreev reflections are suppressed due to strong on-dot Coulomb repulsion. The suppression of the Andreev reflections leads to a violation of the Wiedemann-Franz law and to a non-Fermi liquid ground state.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 115-122
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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