143 citations · 1k across the 32 of their papers we have counts for
33 papers
Large spin splitting metallic altermagnets from machine-learned design rules
Ali Sufyan, Brahim Marfoua, J. Andreas Larsson +2
Altermagnets combine compensated magnetic order with momentum-dependent spin splitting, providing spin-polarized electronic states without a net magnetization. Metallic -wave al…
Giant Rashba Splitting and Enhanced Nonlinear Berry-Phase Responses in Sliding-Tunable vdW MXene Heterostructures
Ali Sufyan, J. Andreas Larsson, Andreas Kreisel +1
Chalcogen-terminated van der Waals MXenes (M2CX2; M = Nb, Ta; X = S, Se) provide a robust platform for exploring strong spin-orbit coupling and proximity engineering. To probe thei…
Second-order phase transitions and divergent linear response in dynamical mean-field theory
Erik G. C. P. van Loon
Second-order phase transitions appear as a divergence in one of the linear response functions. For a system of correlated electrons, the relevant divergent response can and does in…
Downfolding from Ab Initio to Interacting Model Hamiltonians: Comprehensive Analysis and Benchmarking of the DFT+cRPA Approach
Yueqing Chang, Erik G. C. P. van Loon, Brandon Eskridge +8
Model Hamiltonians are regularly derived from first-principles data to describe correlated matter. However, the standard methods for this contain a number of largely unexplored app…
Unconventional charge-density-wave gap in monolayer NbS
Timo Knispel, Jan Berges, Arne Schobert +5
Using scanning tunneling microscopy and spectroscopy, for a monolayer of transition metal dichalcogenide H-NbS grown by molecular beam epitaxy on graphene, we provide unambiguo…
Dual Bethe-Salpeter equation for the multi-orbital lattice susceptibility within dynamical mean-field theory
Erik G. C. P. van Loon, Hugo U. R. Strand
Dynamical mean-field theory describes the impact of strong local correlation effects in many-electron systems. While the single-particle spectral function is directly obtained with…
NbCl: A Prototypical Layered Mott-Hubbard Insulator
Sergii Grytsiuk, Mikhail I. Katsnelson, Erik G. C. P. van Loon +1
The Hubbard model provides an idealized description of electronic correlations in solids. Despite its simplicity, the model features a competition between several different phases…
Larmor precession in strongly correlated itinerant electron systems
Erik G. C. P. van Loon, Hugo U. R. Strand
Many-electron systems undergo a collective Larmor precession in the presence of a magnetic field. In a paramagnetic metal, the resulting spin wave provides insight into the correla…
Two-particle correlations and the metal-insulator transition: Iterated Perturbation Theory revisited
Erik G. C. P. van Loon
Recent advances in many-body physics have made it possible to study correlated electron systems at the two-particle level. In Dynamical Mean-Field theory, it has been shown that th…
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…
Random Phase Approximation for gapped systems: role of vertex corrections and applicability of the constrained random phase approximation
Erik G. C. P. van Loon, Malte Rösner, Mikhail I. Katsnelson +1
The many-body theory of interacting electrons poses an intrinsically difficult problem that requires simplifying assumptions. For the determination of electronic screening properti…
Downfolding approaches to electron-ion coupling: Constrained density-functional perturbation theory for molecules
Erik G. C. P. van Loon, Jan Berges, Tim O. Wehling
Constrained electronic-structure theories enable the construction of effective low-energy models consisting of partially dressed particles. However, the interpretation and physical…
A full gap above the Fermi level: the charge density wave of monolayer VS2
Camiel van Efferen, Jan Berges, Joshua Hall +15
In the standard model of charge density wave (CDW) transitions, the displacement along a single phonon mode lowers the total electronic energy by creating a gap at the Fermi level,…
Efficient fluctuation exchange approach to low-temperature spin fluctuations and superconductivity: from the Hubbard model to NaCoOHO
Niklas Witt, Erik G. C. P. van Loon, Takuya Nomoto +2
Superconductivity arises mostly at energy and temperature scales that are much smaller than the typical bare electronic energies. Since the computational effort of diagrammatic man…
Second-order dual fermion for multi-orbital systems
Erik G. C. P. van Loon
In dynamical mean-field theory, the correlations between electrons are assumed to be purely local. The dual fermion approach provides a systematic way of adding non-local correctio…
Coulomb Engineering of two-dimensional Mott materials
Erik G. C. P. van Loon, Malte Schüler, Daniel Springer +3
Two-dimensional materials can be strongly influenced by their surroundings. A dielectric environment screens and reduces the Coulomb interaction between electrons in the two-dimens…
Ab initio phonon self-energies and fluctuation diagnostics of phonon anomalies: Lattice instabilities from Dirac pseudospin physics in transition metal dichalcogenides
Jan Berges, Erik G. C. P. van Loon, Arne Schobert +2
We present an ab initio approach for the calculation of phonon self-energies and their fluctuation diagnostics, which allows us to identify the electronic processes behind phonon a…
Bandwidth renormalization due to the intersite Coulomb interaction
Yann in 't Veld, Malte Schüler, Tim Wehling +2
The theory of correlated electrons is currently moving beyond the paradigmatic Hubbard , towards the investigation of intersite Coulomb interactions. Recent investigations have…
Precursors of the insulating state in the square lattice Hubbard model
Erik G. C. P. van Loon, Hartmut Hafermann, Mikhail Katsnelson
We study the two-dimensional square lattice Hubbard model for small to moderate interaction strengths by means of the ladder dual fermion approach. The non-local…
The extended Hubbard model with attractive interactions
E. G. C. P. van Loon, M. I. Katsnelson
We discuss the phase diagram of the extended Hubbard model with both attractive and repulsive local and nonlocal interactions. The extended dynamical mean-field theory (EDMFT) and…
Competing Coulomb and electron-phonon interactions in NbS
E. G. C. P. van Loon, M. Rösner, G. Schönhoff +2
The interplay of Coulomb and electron-phonon interactions with thermal and quantum fluctuations facilitates rich phase diagrams in two-dimensional electron systems. Layered transit…
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…
A comparison between methods of analytical continuation for bosonic functions
Johan Schött, Erik G. C. P. van Loon, Inka L. M. Locht +2
In this article we perform a critical assessment of different known methods for the analytical continuation of bosonic functions, namely the maximum entropy method, the non-negativ…
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…