274 citations · 3.7k across the 105 of their papers we have counts for
61 papers · 1 filter
Strongly correlated Josephson junction: proximity effect in the single-layer Hubbard model
Don Rolih, Rok Žitko
We study the proximity effect in the Hubbard model coupled to BCS superconductors describing a single-layer strongly correlated electron system in a phase-biased Josephson junction…
Auxiliary master equation approach to the Anderson-Holstein impurity problem out of equilibrium
D. Werner, R. Žitko, E. Arrigoni
We introduce a method based on auxiliary master equation for solving the problem of an impurity with local electron-electron and electron-phonon interaction embedded between two co…
Topological quantum phase transition of nickelocene on Cu(100)
G. G. Blesio, R. Žitko, L. O. Manuel +1
Local quantum phase transitions driven by Kondo correlations have been theoretically proposed in several magnetic nanosystems; however, clear experimental signatures are scant. Mod…
Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid
R. Žitko, G. G. Blesio, L. O. Manuel +1
The paradigm of Landau's Fermi liquid theory has been challenged with the finding of a strongly interacting Fermi liquid that cannot be adiabatically connected to a non-interacting…
Universal magnetic oscillations of DC conductivity in the incoherent regime of correlated systems
Jaksa Vucicevic, Rok Zitko
Using the dynamical mean field theory we investigate the magnetic field dependence of DC conductivity in the Hubbard model on the square lattice, fully taking into account the orbi…
Electrical conductivity in the Hubbard model: orbital effects of magnetic field
Jaksa Vucicevic, Rok Zitko
Calculation of conductivity in the Hubbard model is a challenging task. Recent years have seen much progress in this respect and numerically exact solutions are now possible in cer…
Charge transport in the Hubbard model at high temperatures: triangular versus square lattice
A. Vranic, J. Vucicevic, J. Kokalj +4
High-temperature bad-metal transport has been recently studied both theoretically and in experiments as one of the key signatures of strong electronic correlations. Here we use the…
Non-Fermi-liquid fixed point in multi-orbital Kondo impurity model relevant for Hund's metals
Alen Horvat, Rok Zitko, Jernej Mravlje
Due to the separation between the spin and the orbital screening scales, the normal state of Hund's metals at ambient temperature can be loosely characterized as a partially cohere…
Kondo screening in a charge-insulating spinon metal
M. Gomilšek, R. Žitko, M. Klanjšek +5
The Kondo effect, an eminent manifestation of many-body physics in condensed matter, is traditionally explained as exchange scattering of conduction electrons on a spinful impurity…
Superconducting quantum dot and the sub-gap states
Rok Zitko
Quantum dots are nanostructures made of semiconducting materials that are engineered to hold a small amount of electric charge (a few electrons) that is controlled by external gate…
Conductivity in the square lattice Hubbard model at high temperatures: importance of vertex corrections
Jaksa Vucicevic, Jure Kokalj, Rok Zitko +3
Recent experiments on cold atoms in optical lattices allow for a quantitative comparison of the measurements to the conductivity calculations in the square lattice Hubbard model. H…
Mottness collapse without metallisation in the domain walls of triangular-lattice Mott insulator 1T-TaS
Jan Skolimowski, Yaroslav Gerasimenko, Rok Žitko
1T-TaS is a charge-density-wave (CDW) compound with a Mott-insulating ground state. The metallic state obtained by doping, substitution or pulsed charge injection is characteri…
A comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems
Sharareh Sayyad, Rok Zitko, Hugo U. R. Strand +2
We study equilibrium and nonequilibrium properties of electron-phonon systems described by the Hubbard-Holstein model using the dynamical mean-field theory. In equilibrium, we benc…
Reversal of particle-hole scattering-rate asymmetry in Anderson impurity model
R. Zitko, H. R. Krishnamurthy, B. Sriram Shastry
We study the particle-hole asymmetry of the scattering rate in strongly correlated electron systems by examining the cubic and terms in the imaginary part of the self-…
Field-Induced Instability of a Gapless Spin Liquid with a Spinon Fermi Surface
M. Gomilšek, M. Klanjšek, R. Žitko +6
The ground state of the quantum kagome antiferromagnet Zn-brochantite, ZnCu(OH)SO, which is one of only a few known spin-liquid (SL) realizations in two or three dimens…
Spin-orbit coupling in three-orbital Kanamori impurity model and its relevance for transition-metal oxides
Alen Horvat, Rok Zitko, Jernej Mravlje
We investigate the effects of the spin-orbit coupling (SOC) in a three-orbital impurity model with Kanamori interaction using the numerical renormalization group method. We focus o…
A Strange Metal from Gutzwiller correlations in infinite dimensions II: Transverse Transport, Optical Response and Rise of Two Relaxation Rates
Wenxin Ding, Rok Žitko, B Sriram Shastry
Using two approaches to strongly correlated systems, the extremely correlated Fermi liquid theory and the dynamical mean field theory, we compute the transverse transport coefficie…
A new high-temperature quantum spin liquid with polaron spins
Martin Klanjsek, Andrej Zorko, Rok Zitko +6
The existence of a quantum spin liquid (QSL) in which quantum fluctuations of spins are sufficiently strong to preclude spin ordering down to zero temperature was originally propos…
A Strange Metal from Gutzwiller correlations in infinite dimensions
Wenxin Ding, Rok Žitko, Peizhi Mai +2
Recent progress in extremely correlated Fermi liquid theory (ECFL) and dynamical mean field theory (DMFT) enables us to compute in the limit the resistivity of the $…
Fine structure of the spectra of the Kondo lattice model: two-site cellular DMFT study
Žiga Osolin, Rok Žitko
We study the antiferromagnetic and the paramagnetic Kondo insulator phases of the Kondo lattice model on the cubic lattice at half-filling using the cellular dynamical mean-field t…
Non-perturbative effects and indirect exchange interaction between quantum impurities on metallic (111) surfaces
A. Allerdt, R. Žitko, A. E. Feiguin
The (111) surface of noble metals is usually treated as an isolated two dimensional (2D) triangular lattice completely decoupled from the bulk. However, unlike topological insulato…
Magnetic impurities in spin-split superconductors
Willem-Victor van Gerven Oei, D. Tanaskovic, Rok Zitko
Hybrid semiconductor-superconductor quantum dot devices are tunable physical realizations of quantum impurity models for a magnetic impurity in a superconducting host. The binding…
Transport and Optical Conductivity in the Hubbard Model: A High-Temperature Expansion Perspective
Edward Perepelitsky, Andrew Galatas, Jernej Mravlje +4
We derive analytical expressions for the spectral moments of the dynamical response functions of the Hubbard model using the high-temperature series expansion. We consider generic…
Kondo effect at low electron density and high particle-hole asymmetry in 1D, 2D, and 3D
Rok Zitko, Alen Horvat
Using the perturbative scaling and the NRG, we study the characteristic energy scales in the Kondo impurity problem as a function of the exchange coupling constant and the cond…