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1
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Thermoelectric Transport through a Quantum Dot Coupled to a Normal Metal and BCS Superconductor

100%
Krawiec M.
Acta Physica Polonica A
|
2008
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vol. 114
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issue 1
115-122
EN
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.
2
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Spectral Functions of the Quantum Dot Coupled to Normal and/or Superconducting Leads

63%
Krawiec M., Wysokiński K.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 1
197-200
EN
We study the spectrum of the quantum dot coupled to two external leads, which may be normal and/or superconducting. The dot is described by the Anderson-Hubbard impurity model in the infinity U limit. The impurity spectral function shows complex behavior depending on the temperature and the state of the leads. For normal leads and at low temperature we observe the appearance of the Kondo resonance, while for BCS-like superconducting leads the bound states emerge due to absence of low energy excitations in the leads.
3
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Spontaneous Currents in a Ferromagnet-Normal Metal-Superconductor Trilayer

51%
Krawiec M., Annett J., Györffy B.
Acta Physica Polonica A
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2006
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vol. 109
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issue 4-5
507-512
EN
We discuss the ground state properties of the system composed of a normal metal sandwiched between ferromagnet and superconductor within a tight binding Hubbard model. We solved the spin-polarized Hartree-Fock-Gorkov equations together with the Maxwell equation (Ampere's law) and found a proximity induced Fulde-Ferrell-Larkin-Ovchinnikov state in this system. Here we show that the inclusion of the normal metal layer in between those subsystems does not necessarily lead to the suppression of the Fulde-Ferrell-Larkin-Ovchinnikov phase. Moreover, we found that depending on the thickness of the normal metal slab the system can be switched periodically between the state with the spontaneous current flowing to that one with no current. All these effects can be explained in terms of the Andreev bound states formed in such structures.
4
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Salmonella spp. as a cause of mortality and clinical symptoms in free-living garden bird species in Poland

51%
Krawiec M., Pietkiewicz M., Wieliczko A.
Polish Journal of Veterinary Sciences
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2014
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issue 4
5
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Antimicrobial susceptibility of Salmonella spp.strains isolated from free-living birds

51%
Krawiec M., Rusiecki S., Kuczkowski M., Wieliczko A.
Polish Journal of Veterinary Sciences
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2017
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issue 4
6
Content available remote

Do Van Hove Singularities in Leads Influence Tunneling Current through Quantum Dot?

51%
Krawiec M., Domański T., Wysokiński K.
Acta Physica Polonica A
|
1998
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vol. 94
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issue 3
411-414
EN
Using the Landauer type formula for the current through quantum dot we have studied the influence of the singularities in the density of states in leads on the differential conductance of the system and answered affirmatively the above question. The presence of Van Hove singularities in the leads may induce an additional structure on the conductance vs. voltage curve. The dot itself has been described by the single impurity Anderson model with a very strong "on-dot" Coulomb repulsion. We also simulate the effect of electron-phonon interaction in the dot by allowing for the fluctuations of the "impurity" energy level.
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