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1
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Spin-Dependent Transport through SU(4) Kondo Dot in the Presence of Spin-Flip Processes

100%
Krychowski D., Lipiński S.
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issue 5
955-956
EN
The spin-resolved current of carbon nanotube quantum dot coupled to ferromagnetic electrodes and influenced by spin-flip scattering is studied in the Kondo regime by the equation of motion method.
2
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Correlation Effects and Spin Dependent Transport in Carbon Nanostructures

100%
Lipiński S., Krychowski D.
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vol. 126
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issue 1
190-193
EN
The impact of symmetry breaking perturbations on the spin dependent transport through carbon nanotube quantum dots in the Kondo regime is discussed. The proposals of spin filter, spin valve and spin battery are presented.
3
Content available remote

Tunnel Magnetoresistance in Carbon Nanotube Quantum Dot

100%
Krychowski D., Lipiński S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
545-548
EN
The out-of-equilibrium transport properties of carbon nanotube quantum dot in the Kondo regime are studied by means of the non-equilibrium Green function. The equation of motion method is used. The influence of the polarization of electrodes and orbital level splitting, as well as left-right asymmetry, on the spin polarizations of differential conductance are discussed. For zero bias voltage and orbitally degenerate states the SU(4) symmetry of Kondo state is preserved for antiparallel configuration of polarizations of electrodes, whereas it is broken for parallel. In the former case a suppression of linear conductance with increasing polarization is observed. In the latter the behaviour is nonmonotonic due to splitting of the Kondo peak and bringing closer one of the peaks to the Fermi level with increasing polarization. This gives rise to giant tunnel linear magnetoresistance for large polarization.
4
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Kondo-Fano Effect in Double Quantum Dot Side Attached to a Pair of Wires

100%
Krychowski D., Lipiński S.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
487-489
EN
Electron tunneling through a double quantum dot side coupled to a pair of leads is examined in finite-U slave boson mean field approach. Both the two-impurity Kondo regime at half filling and one-and three-electron Kondo effects are analyzed. Special attention is paid to the case when one of the dots is coupled to ferromagnetic lead and another to nonmagnetic. Depending on the gate voltage, the same or opposite sign of polarizations of conductance of the leads is observed.
5
Content available remote

Two Kondo Impurities in Armchair Graphene Nanoribbon

100%
Lipiński S., Krychowski D.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1063-1065
EN
An interplay of the Kondo effect and inter-impurity correlations in the armchair graphene nanoribbon is studied in the mean field slave boson approach. The effect of the hole doping is examined.
6
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Kondo Effect in Carbon Nanotube Quantum Dot in a Magnetic Field

100%
Krychowski D., Lipiński S.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
293-295
EN
The out-of-equilibrium electron transport of carbon nanotube semiconducting quantum dot placed in a magnetic field is studied in the Kondo regime by means of the non-equilibrium Green functions. The equation of motion method is used. For parallel magnetic field the Kondo peak splits into four peaks, following the simultaneous splitting of the orbital and spin states. For perpendicular field orientation the triple peak structure of density of states is observed with the central peak corresponding to orbital Kondo effect and the satellites reflecting the spin and spin-orbital fluctuations.
7
Content available remote

Thermoelectric Effects in Carbon Nanotube Quantum Dot in the Kondo Regime

100%
Krychowski D., Lipiński S.
Acta Physica Polonica A
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2008
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vol. 113
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issue 2
645-649
EN
Thermoelectric effects in a carbon nanotube quantum dot in the Kondo regime are studied by the equation of motion method. The thermopower is highly sensitive to the structure of the spectral density near the Fermi edge. For temperatures close to the Kondo temperature the thermopower approaches a local minimum, which becomes sharper for orbital energies closer to the Fermi level. For higher temperatures the tjermopower increases, but in the temperature range corresponding to charging energy it again drops and achieves significant negative values. We examine the consequences of symmetry breaking of spin-orbital SU(4) system on thermopower.
8
Content available remote

Fano-Kondo Effect of Magnetic Impurity with Side-Coupled Graphene Flake

81%
Krychowski D., Kopiński J., Lipiński S.
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vol. 126
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issue 1
202-203
EN
We examine transport through a spin-1/2 Kondo impurity, patterned between atomic scale electrodes in the presence of side-coupled nanographene flake. Impurity is attached to the edge of the flake, what allows to test the edge states. The Kotliar Ruckenstein slave boson approach is adopted to describe the strongly correlated impurity. We show that transport measurement of Fano-Kondo effect can serve as a spectroscopic probe of spin resolved graphene flake energy levels. The edge moments can be completely suppressed by gate voltage.
9
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Spin Dependent Conductance of a Quantum Dot Side attached to Topological Superconductors as a Probe of Majorana Fermion States

81%
Krychowski D., Lipiński S., Cuniberti G.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
552-554
EN
Spin-polarized transport through a quantum dot side attached to a topological superconductor and coupled to a pair of normal leads is discussed in Coulomb and Kondo regimes. For discussion of Coulomb range equation of motion method with extended Hubbard I approximation is used and Kondo regime is analyzed by Kotliar-Ruckenstein slave boson approach. Apart from the occurrence of zero bias anomaly the presence of Majorana states reflects also in splitting of Coulomb lines. In the region of Coulomb borders the spin dependent negative differential conductance is observed. Due to the low energy scale of Kondo effect this probe allows for detection of Majorana states even for extremely weak coupling with topological wire. In this range no signatures of Majorana states appear in Coulomb blockade dominated transport.
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