403 citations · 2.6k across the 72 of their papers we have counts for
8 papers · 1 filter
Spin-charge separation and simultaneous spin and charge Kondo effect
Rok Zitko, Janez Bonca
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-ch…
In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu(2-x)Mgx(BO3)2
S. Haravifard, S. R. Dunsiger, S. El Shawish +4
High resolution neutron scattering measurements on a single crystal of SrCu(2-x)Mgx(BO3)2 with x=0.05 reveal the presence of new spin excitations within the gap of this quasi-two d…
Spin-polaron excitations in a doped Shastry-Sutherland model
S. El Shawish, J. Bonca
Using variational algorithm on an infinite Shastry-Sutherland (SS) lattice we show that the introduction of a static nonmagnetic impurity into a dimerized ground state leads to a f…
Fermi-liquid versus non-Fermi-liquid behavior in triple quantum dots
Rok Zitko, Janez Bonca
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…
Multi-impurity Anderson model for quantum dots coupled in parallel
R. Zitko, J. Bonca
The system of several (N) quantum dots coupled in parallel to the same single-mode conduction channel can be modelled as a single-channel N-impurity Anderson model. Using the gener…
Zero-Bias Conductance Through Side-Coupled Double Quantum Dots
J. Bonca, R. Zitko
Low temperature zero-bias conductance through two side-coupled quantum dots is investigated using Wilson's numerical renormalization group technique. A low-temperature phase diagra…