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cond-mat.mtrl-sci2026
High-fidelity kp representations of first-principles electronic band structures through covariant renormalization
Kristian Berland
The kp method can be applied directly to first-principles energies and momentum matrix elements, but the resulting models converge slowly with the number of bands and are in…
cond-mat.mtrl-sci2026
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…
cond-mat.mtrl-sci2026
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…