107 citations · 409 across the 10 of their papers we have counts for
10 papers
Exciton Superfluidity in 2D Heterostructures from First Principles: The importance of material specific screening
Rune Højlund, Emil Grovn, Sahar Pakdel +2
Recent theoretical and experimental studies suggest that van der Waals heterostructures with n- and p-doped bilayers of transition metal dichalcogenides are promising facilitators…
Excitonic insulators and superfluidity in 2D bilayers without external fields
Fredrik Nilsson, Mikael Kuisma, Sahar Pakdel +1
We explore a new platform for realising excitonic insulators, namely van der Waals (vdW) bilayers comprising 2D Janus materials. In previous studies, Type-II heterobilayers have be…
Effects of dynamical screening on the BCS-BEC crossover in double bilayer graphene: Density functional theory for exciton bilayers
Fredrik Nilsson, Ferdi Aryasetiawan
We derive a gap equation for bilayer excitonic systems based on density functional theory and benchmark our results against quantum Monte-Carlo simulations and recent experiments o…
Normal state of NdSrNiO from self-consistent +EDMFT
Francesco Petocchi, Viktor Christiansson, Fredrik Nilsson +2
The recent discovery of superconductivity in hole-doped NdNiO thin films has captivated the condensed matter physics community. Such compounds with a formal Ni valence have…
Screening from states and antiferromagnetic correlations in perovskites: A +EDMFT investigation
Francesco Petocchi, Fredrik Nilsson, Ferdi Aryasetiawan +1
We perform a systematic {\it ab initio} study of the electronic structure of Sr(V,Mo,Mn)O perovskites, using the parameter-free +EDMFT method. This approach self-consistent…
Position Representation of Effective Electron-Electron Interactions in Solids
Tor Jonas Sjöstrand, Fredrik Nilsson, Christoph Friedrich +1
An essential ingredient in many model Hamiltonians, such as the Hubbard model, is the effective electron-electron interaction , which enters as matrix elements in some localized…
Dynamically screened Coulomb interaction in the parent compounds of hole-doped cuprates, trends and exceptions
Fredrik Nilsson, Krister Karlsson, Ferdi Aryasetiawan
Although the cuprate high-temperature superconductors were discovered already 1986 the origin of the pairing mechanism remains elusive. While the doped compounds are superconductin…
Multitier self-consistent +EDMFT
Fredrik Nilsson, Lewin Boehnke, Philipp Werner +1
We discuss a parameter-free and computationally efficient ab initio simulation approach for moderately and strongly correlated materials, the multitier self-consistent +EDMFT m…
When strong correlations become weak: Consistent merging of and DMFT
Lewin Boehnke, Fredrik Nilsson, Ferdi Aryasetiawan +1
The cubic perovskite SrVO is generally considered to be a prototype strongly correlated metal with a characteristic three-peak structure of the -electron spectral function,…
Dynamical screening in La2CuO4
Philipp Werner, Rei Sakuma, Fredrik Nilsson +1
We show that the dynamical screening of the Coulomb interaction among Cu-d electrons in high-Tc cuprates is very strong and that a proper treatment of this effect is essential for…