5k citations · 15.1k across the 167 of their papers we have counts for
64 papers · 1 filter
Quantitative theory of magnetic properties of elemental praseodymium
Leonid V. Pourovskii, Alena Vishina, Olle Eriksson +1
Elemental Pr metal crystallizes in the double hexagonal close packed (dhcp) structure and is unique among rare-earth elements in featuring a localized partially filled 4f shell wit…
Superconductivity of Bad Fermions: Origin of Two Gaps in HTSC Cuprates
E. A. Stepanov, S. Iskakov, M. I. Katsnelson +1
We investigate the spectral properties of the doped Hubbard model with parameters typical for high-temperature cuprate superconductors. Our approach is based on a novel st…
From strong to weak correlations in breathing-mode kagome van der Waals materials: Nb(F,Cl,Br,I) as a robust and versatile platform for many-body engineering
Joost Aretz, Sergii Grytsiuk, Xiaojing Liu +12
By combining ab initio downfolding with cluster dynamical mean-field theory, we study the degree of correlations in monolayer, bilayer and bulk breathing-mode kagome van der Waals…
Perturbative solution of fermionic sign problem in lattice Quantum Monte Carlo
Sergei Iskakov, Mikhail I. Katsnelson, Alexander I. Lichtenstein
We develop a strong-coupling perturbation scheme for a generic Hubbard model around a half-filled particle-hole-symmetric reference system, which is free from the fermionic sign pr…
Local Plaquette Physics as Key Ingredient of High-Temperature Superconductivity in Cuprates
M. Danilov, E. G. C. P. van Loon, S. Brener +3
A major pathway towards understanding complex systems is given by exactly solvable reference systems that contain the essential physics of the system. For the Hubbard mode…
Dynamically induced doublon repulsion in the Fermi-Hubbard model probed by a single-particle density of states
V. N. Valmispild, C. Dutreix, M. Eckstein +3
We investigate the possibility to control dynamically the interactions between repulsively bound pairs of fermions (doublons) in correlated systems with off-resonant ac fields. We…
Introducing strong correlation effects into graphene by gadolinium intercalation
S. Link, S. Forti, A. Stöhr +11
Exotic ordered ground states driven by electronic correlations are expected to be induced in monolayer graphene when doped to the Van Hove singularity. Such doping levels are reach…
Effective Ising model for correlated systems with charge ordering
E. A. Stepanov, A. Huber, A. I. Lichtenstein +1
Collective electronic fluctuations in correlated materials give rise to various important phenomena, such as existence of the charge ordering, superconductivity, Mott insulating an…
Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators
M. M. S. Barbeau, M. Eckstein, M. I. Katsnelson +1
In order to have a better understanding of ultrafast electrical control of exchange interactions in multi-orbital systems, we study a two-orbital Hubbard model at half filling unde…
Effective Heisenberg model and exchange interaction for strongly correlated systems
E. A. Stepanov, S. Brener, F. Krien +3
We consider the extended Hubbard model and introduce a corresponding Heisenberg-like problem written in terms of spin operators. The derived formalism is reminiscent of Anderson's…
Conservation in two-particle self-consistent extensions of dynamical-mean-field-theory
F. Krien, E. G. C. P. van Loon, H. Hafermann +3
Extensions of dynamical-mean-field-theory (DMFT) make use of quantum impurity models as non-perturbative and exactly solvable reference systems which are essential to treat the str…
First-order metal-insulator transitions in the extended Hubbard model due to self-consistent screening of the effective interaction
M. Schüler, E. G. C. P. van Loon, M. I. Katsnelson +1
While the Hubbard model is the standard model to study Mott metal-insulator transitions, it is still unclear to which extent it can describe metal-insulator transitions in real sol…
Band filling control of the Dzyaloshinskii-Moriya interaction in weakly ferromagnetic insulators
G. Beutier, S. P. Collins, O. V. Dimitrova +8
We observe and explain theoretically a dramatic evolution of the Dzyaloshinskii-Moriya interaction in the series of isostructural weak ferromagnets, MnCO, FeBO, CoCO an…
Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory
G. Rohringer, H. Hafermann, A. Toschi +6
Strong electronic correlations pose one of the biggest challenges to solid state theory. We review recently developed methods that address this problem by starting with the local,…
Exchange interactions in transition metal oxides: The role of oxygen spin polarization
R. Logemann, A. N. Rudenko, M. I. Katsnelson +1
Magnetism of transition metal (TM) oxides is usually described in terms of the Heisenberg model, with orientation-independent interactions between the spins. However, the applicabi…
Role of direct exchange and Dzyaloshinskii-Moriya interactions in magnetic properties of graphene derivatives: CF and CH
V. V. Mazurenko, A. N. Rudenko, S. A. Nikolaev +3
According to the Lieb's theorem the ferromagnetic interaction in graphene-based materials with bipartite lattice is a result of disbalance between the number of sites available for…
Spin-orbit coupling and magnetic interactions in Si(111):{C,Si,Sn,Pb}
D. I. Badrtdinov, S. A. Nikolaev, M. I. Katsnelson +1
We study the magnetic properties of the adatom systems on a semiconductor surface Si(111):\{C,Si,Sn,Pb\} - (). On the basis of all-electron density functi…
Capturing non-local interaction effects in the Hubbard model: optimal mappings and limits of applicability
E. G. C. P. van Loon, M. Schüler, M. I. Katsnelson +1
We investigate the Peierls-Feynman-Bogoliubov variational principle to map Hubbard models with nonlocal interactions to effective models with only local interactions. We study the…
Plaquette Valence Bond Theory of High-Temperature Superconductivity
M. Harland, M. I. Katsnelson, A. I. Lichtenstein
We present a strong-coupling approach to the theory of high-temperature superconductivity based on the observation of a quantum critical point in the plaquette within the t,t' Hubb…
From local to non-local correlations: the Dual Boson perspective
E. A. Stepanov, A. Huber, E. G. C. P. van Loon +2
Extended dynamical mean-field theory (EDMFT) is insufficient to describe non-local effects in strongly correlated systems, since corrections to the mean-field solution are generall…
Many-body effects on graphene conductivity: Quantum Monte Carlo calculations
D. L. Boyda, V. V. Braguta, M. I. Katsnelson +1
Optical conductivity of graphene is studied using Quantum Monte Carlo calculations. We start from Euclidean current-current correlator and extract from Green-Kubo relations…
Racah materials: role of atomic multiplets in intermediate valence systems
A. B. Shick, L. Havela, A. I. Lichtenstein +1
We address the long-standing mystery of the nonmagnetic insulating state of the intermediate valence compound SmB. Within a combination of the local density approximation (LDA)…
Self-consistent Dual Boson approach to single-particle and collective excitations in correlated systems
E. A. Stepanov, E. G. C. P. van Loon, A. A. Katanin +3
We propose an efficient dual boson scheme, which extends the DMFT paradigm to collective excitations in correlated systems. The theory is fully self-consistent both on the one- and…
Many-body effects in graphene beyond the Dirac model with Coulomb interaction
N. Yu. Astrakhantsev, V. V. Braguta, M. I. Katsnelson
This paper is devoted to development of perturbation theory for studying the properties of graphene sheet of finite size, at nonzero temperature and chemical potential. The perturb…