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The In-Gap Charge Current through the Correlated Quantum Dot Hybridized with Superconductor

100%
Donabidowicz A., Domański T.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
75-82
EN
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 → ∞.
2
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Fluctuations between the BCS and BEC Limits in the System of Ultracold Alkali Atoms

100%
Domański T., Donabidowicz A.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
471-476
EN
We investigate the fluctuations induced by time-dependent interchange between the Bardeen-Cooper-Schrieffer and Bose-Einstein condensation regimes in the ultracold gas of fermion atoms. Such crossover can be triggered by varying the external magnetic field across the Feshbach resonance. Experimental realization is usually done via very fast switching which leads to the nonequilibrium effects. In this paper we focus on the ground state properties. In particular, we analyze time dependence of the wave function and consider fluctuations of the order parameters.
3
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Tunneling through the Quantum Dot Coupled to Incoherent Superconductor

100%
Donabidowicz A., Domański T.
Acta Physica Polonica A
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2007
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vol. 111
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issue 5
671-682
EN
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.
4
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Subgap Current through the Strongly Correlated Quantum Dot Hybridized with the Normal and Superconducting Leads

100%
Domański T., Donabidowicz A.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
86-88
EN
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.
5
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Relativistic Theory of Superconductivity: BCS vs. Bogolyubov-de Gennes Approaches

81%
Ciechan A., Donabidowicz A., Wysokiński K.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
699-702
EN
In this paper we shall present the results of numerical calculations of the superconducting characteristics (temperature dependence of the gap function and specific heat) for few different symmetries of the order parameter in relativistic theory of superconductivity. We shall discuss relevance of the results to describe newly discovered superconductors, particularly those containing heavy elements with strong spin-orbit coupling.
6
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Tunneling through the Quantum Dot Coupled between Normal and Superconducting Leads

81%
Donabidowicz A., Domański T., Wysokiński K.
Acta Physica Polonica A
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2007
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vol. 112
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issue 2
157-160
EN
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.
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