60 citations · 557 across the 44 of their papers we have counts for
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quant-ph2021
Making ab initio QED functional(s): Non-perturbative and photon-free effective frameworks for strong light-matter coupling
Christian Schäfer, Florian Buchholz, Markus Penz +2
Strong light-matter coupling provides a promising path for the control of quantum matter where the latter is routinely described from first-principles. However, combining the quant…
quant-ph2021
Density-Functional Theory on Graphs
Markus Penz, Robert van Leeuwen
The principles of density-functional theory are studied for finite lattice systems represented by graphs. Surprisingly, the fundamental Hohenberg-Kohn theorem is found void in gene…