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Interplay between the Correlations and Superconductivity in Electron Transport through the Double Quantum Dots

100%
Barański J., Domański T.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1213-1215
EN
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.
2
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Interference Effects on Double Quantum Dots Coupled Between Metallic and Superconducting Leads

100%
Barański J., Domański T.
Acta Physica Polonica A
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2012
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vol. 121
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issue 4
812-815
EN
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.
3
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Phonon Signatures of a Quantum Impurity with Induced Electron Pairing

100%
Barański J., Domański T.
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vol. 126
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issue 4a
A-73-A-76
EN
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.
4
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Industrial Tests of Steel Filtering Process

61%
Bulkowski L., Kania H., Pieprzyca J., Galisz U., Kudliński Z., Barański J.
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issue 1
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