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    Wyświetlanie 1-10 z 10
    Tytuł:
    Interplay between the Correlations and Superconductivity in Electron Transport through the Double Quantum Dots
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1428494.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    Opis:
    We study the influence of electron correlations on nonequilibrium transport through the quantum dots coupled between one metallic and one superconducting electrode. Such type of nanodevices are characterized by the induced on-dot pairing spread from the superconducting lead (proximity effect) and effectively responsible for mixing the particle with hole excitations. On the other hand, strong Coulomb repulsion between the opposite spin electrons tends to suppress a double occupancy of the quantum dots competing with the on-dot superconducting order. The Coulomb interactions can also cause a screening of the quantum dot spin by itinerant electrons of the metallic lead giving rise to formation of the Kondo resonance. We analyze interplay of such phenomena for the setup of double quantum dots where the quantum interference (such as Fano) effects influence the subgap electron transport through the Andreev scattering.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1213-1215
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single Particle Excitation Spectrum of a Proximized Quantum Dot: The Flow Equation Study
    Autorzy:
    Zapalska, M.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374179.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.10.Cc
    71.27.+a
    72.15.Qm
    74.45.+c
    Opis:
    We study the in-gap states of a quantum dot hybridized with the metallic and superconducting reservoirs applying the continuous unitary transformation to the Anderson-type Hamiltonian. We derive the set of flow equations and analyse the effective single particle excitation spectrum of the correlated quantum dot in presence of the induced electron pairing.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-137-A-140
    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:
    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:
    Interference Effects on Double Quantum Dots Coupled Between Metallic and Superconducting Leads
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1431289.pdf
    Data publikacji:
    2012-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    Opis:
    We describe the quantum interference effects in the nanodevice consisting of the double quantum dot coupled to the metallic and superconducting electrodes. In such heterostructures the superconducting properties are spread to the quantum dot due to the proximity effect. We investigate the density of states and anomalous Andreev conductance of the interfacial quantum dot exploring the conditions necessary for appearance of the Fano-type lineshapes. We also consider the electron correlations and discuss an interplay between the Coulomb blockade and the Fano-type interference.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 4; 812-815
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Signatures of a Quantum Impurity with Induced Electron Pairing
    Autorzy:
    Barański, J.
    Domański, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374760.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    74.50.+r
    63.22.-m
    Opis:
    We analyze the effective spectrum of a vibrating molecule coupled between one conducting and another superconducting electrode. The proximity effect induces electron pairing which is manifested by the subgap quasiparticle peaks (the Andreev states) whose broadening depends on a hybridization with the conducting electrode. On the other hand, the electron-phonon interaction leads to a multilevel structure with the polaronic states separated by the phonon energy. We inspect a combined effect of both these (polaronic and induced pairing) phenomena.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-73-A-76
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Subgap Current through the Strongly Correlated Quantum Dot Hybridized with the Normal and Superconducting Leads
    Autorzy:
    Domański, T.
    Donabidowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810301.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    74.20.Fg
    74.45.+c
    Opis:
    We investigate charge tunneling through the strongly correlated quantum dot placed between the metallic and superconducting leads. For small voltages |V| ≤ Δ/e applied across the junction the current is transmitted by the anomalous mechanism of the Andreev reflections. Such transport is sensitive to the strong Coulomb interactions which can be responsible for the charging effect and, at low temperatures, for appearance of the Kondo resonance. We analyze their signatures in the differential Andreev conductance.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 86-88
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tunneling through the Quantum Dot Coupled between Normal and Superconducting Leads
    Autorzy:
    Donabidowicz, A.
    Domański, T.
    Wysokiński, K. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047369.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.23.-b
    74.20.Fg
    74.45.+c
    Opis:
    We study the charge tunneling via the quantum dot coupled to normal and superconducting leads, where the superconducting electrode has either an isotropic or anisotropic (of d-wave symmetry) energy gap. We use the single impurity Anderson model and apply the nonequilibrium Green function formalism to determine the differential tunneling conductance. The influence of the proximity effect between the quantum dot and superconductor on the transport properties of the system manifests itself in the Andreev conductance.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 157-160
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistics of Tunneling Events in Three-Terminal Hybrid Devices with Quantum Dot
    Autorzy:
    Michałek, G.
    Bułka, B.
    Domański, T.
    Wysokiński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030466.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.45.+c
    73.23.Hk
    72.70.+m
    73.63.Kv
    Opis:
    We investigate statistics of the tunneling events in the short time limit in terms of the waiting time distribution (WTD), defined as the probability for a delay time between two subsequent transitions of particles, and consider it for a quantum dot (QD) strongly coupled to a superconducting and weakly coupled to two normal electrodes. Our study focuses on the WTD in the subgap transport, when coherent exchange of the Cooper pairs occurs between the QD and the superconductor. The dynamics can be described in terms of a Markovian generalized master equation for the reduced density matrix. We observe coherent oscillations between the Andreev bound states in the correlated jumps, both for the local and non-local WTDs. In addition the analysis of the transient currents give us some insight into dominant relaxation processes in short time scales.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 391-393
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Spectroscopy in Three-Terminal Hybrid Nanostructure
    Autorzy:
    Michałek, G.
    Bułka, B.
    Urbaniak, M.
    Domański, T.
    Wysokiński, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385343.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.Kv
    73.23.Hk
    74.45.+c
    Opis:
    We consider a hybrid three-terminal structure consisting of a quantum dot coupled to three leads, two normal and one superconducting. The current flowing between one of the normal and the superconducting electrodes induces voltage in the other normal (floating) electrode. The value of the induced voltage depends on the position of the Andreev levels in the quantum dot and is a measure of the interplay between the electron transfer and the subgap anomalous reflection processes. When the crossed (i.e. non-local) Andreev reflections dominate the induced potential in the normal electrode becomes negative. This situation occurs for the relatively strong coupling to the superconducting electrode and only outside the Coulomb blockade region. Taking the superconducting electrode as the voltage probe one gets additional information on competition of injected carriers.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 293-295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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