Kondo screening in high-spin side-coupled two-impurity clusters (2009)
We study the system of two magnetic impurities described by a two-impurity Kondo model where only the first impurity couples directly to the conduction band, while the second impurity interacts with...
Lee, Minchul, Choi, Mahn-Soo, Lopez, Rosa, Aguado, Ramon, Martinek, Jan, Zitko, Rok
We study a series-coupled double quantum dot in the Kondo regime modeled by the two-impurity Anderson model and find a new conduction-band mediated superexchange interaction that competes with Kondo...
Superconductivity in the Kondo lattice model (2009)
Bodensiek, Oliver, Zitko, Rok, Pruschke, Thomas
We study the Kondo lattice model with additional attractive interaction between the conduction electrons within the dynamical mean-field theory using the numerical renormalization group to solve the...
Van Hove singularities in the paramagnetic phase of the Hubbard model: a DMFT study (2009)
Zitko, Rok, Bonca, Janez, Pruschke, Thomas
Using the dynamical mean-field theory (DMFT) we study the paramagnetic phase of the Hubbard model with the density of states (DOS) corresponding to the three-dimensional cubic lattice and the...
The ground-state energy of a quantum impurity model can be calculated using the numerical renormalization group with a modified discretization scheme, with sufficient accuracy to reliably extract...
Convergence acceleration and stabilization for dynamical-mean-field-theory calculations (2009)
The convergence to the self-consistency in the dynamical-mean-field-theory (DMFT) calculations for models of correlated electron systems can be significantly accelerated by using an appropriate...
Splitting of the Kondo resonance in anisotropic magnetic impurities on surfaces (2009)
Zitko, Rok, Peters, Robert, Pruschke, Thomas
Using the numerical renormalization group method, we study the splitting of the Kondo resonance by a magnetic field applied in different directions in the Kondo model for anisotropic magnetic...
Adaptive logarithmic discretization for numerical renormalization group methods (2009)
The problem of the logarithmic discretization of an arbitrary positive function (such as the density of states) is studied in general terms. Logarithmic discretization has arbitrary high resolution...
Anomaly in the heat capacity of Kondo superconductors (2008)
Using numerical renormalization group we study thermodynamic properties of a magnetic impurity described by the Anderson impurity model in a superconducting host material described by the BCS...
Energy resolution and discretization artefacts in the numerical renormalization group (2008)
We study the limits of the energy resolution that can be achieved in the calculations of spectral functions of quantum impurity models using the numerical renormalization group (NRG) technique with...
Properties of anisotropic magnetic impurities on surfaces (2008)
Zitko, Rok, Peters, Robert, Pruschke, Thomas
Using numerical renormalization group techniques, we study static and dynamic properties of a family of single-channel Kondo impurity models with axial magnetic anisotropy $DS_z^2$ terms; such models...
Quantum phase transitions in the systems of parallel quantum dots (2007)
We study the low-temperature transport properties of the systems of parallel quantum dots described by the N-impurity Anderson model. We calculate the quasiparticle scattering phase shifts, spectral...
Vibrational effects on low-temperature properties of molecular conductors (2007)
Mravlje, Jernej, Ramsak, Anton, Zitko, Rok
We calculate characteristic correlation functions for the Anderson model with additional phonon-assisted coupling to the odd conduction channel. This model describes, for example, the behavior of a...
Spin-charge separation and simultaneous spin and charge Kondo effect (2006)
We study the spin-charge separation in a Kondo-like model for an impurity with a spin and a charge (isospin) degree of freedom coupled to a single conduction channel (the ``spin-charge'' Kondo...
Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots (2006)
We study the effect of electron hopping in triple quantum dots modelled by the three-impurity Anderson model. We determine the range of hopping parameters where the system exhibits the two-channel...
Enhanced Conductance Through Side-Coupled Double Quantum Dots (2005)
Conductance, on-site and inter-site charge fluctuations and spin correlations in the system of two side-coupled quantum dots are calculated using the Wilson's numerical renormalization group (NRG)...
We develop a non-perturbative numerical method to study a single electron tunneling through an Aharonov-Bohm ring in the presence of bound, interacting electrons. Inelastic processes and spin-flip...