5 papers · 1 filter
Plasmonic properties and correlation energies from a compact multipole representation of the dielectric response in 2D metals
Dario A. Leon, Claudia Cardoso, Kristian Berland
Multipole-Padé approximants provide a compact representation of dynamical response functions in terms of a small number of collective modes. Here, we generalize this framework to i…
Momentum- and frequency-resolved collective electronic excitations in solids: insights from spectroscopy and first-principles calculations
Dario A. Leon, Kristian Berland
Collective electronic excitations, including plasmons, excitons, and intra- and interband transitions, play a central role in determining the dynamic screening, optical response, a…
Self-consistent layer-projected scissors operator for band structures of complex 2D van der Waals materials
Dario A. Leon, Mikael Kuisma, Mikkel Ohm Sauer +6
We introduce a computationally efficient method to calculate the quasiparticle (QP) band structure of general van der Waals (vdW) heterostructures. A layer-projected scissors (LAPS…
Spectral properties from an efficient analytical representation of the self-energy within a multipole approximation
Dario A. Leon, Kristian Berland, Claudia Cardoso
We propose an efficient analytical representation of the frequency-dependent self-energy via a multipole approximation (MPA-). The multipole-Padé model for the self-ene…
Unraveling many-body effects in ZnO: Combined study using momentum-resolved electron energy-loss spectroscopy and first-principles calculations
Dario A. Leon, Cana Elgvin, Phuong Dan Nguyen +3
We present a detailed study of the dielectric response of ZnO using a combination of low-loss momentum-resolved electron energy-loss spectroscopy (EELS) and first-principles calcul…