536 citations · 2.1k across the 27 of their papers we have counts for
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cond-mat.other2011★ 37 cited
Time-dependent density-functional and reduced density-matrix methods for few electrons: Exact versus adiabatic approximations
N. Helbig, J. I. Fuks, I. V. Tokatly +3
To address the impact of electron correlations in the linear and non-linear response regimes of interacting many-electron systems exposed to time-dependent external fields, we stud…
cond-mat.other2011★ 83 cited
Non-linear phenomena in time-dependent density-functional theory: What Rabi physics can teach us
J. I. Fuks, N. Helbig, I. V. Tokatly +1
Through the exact solution of a two-electron system interacting with a monochromatic laser we prove that all adiabatic density functionals within time-dependent density-functional…
cond-mat.other2009★ 19 cited
Is there a physical meaning of the natural orbitals? Analysis of exactly solvable models
N. Helbig, I. V. Tokatly, A. Rubio
We investigate the suitability of natural orbitals as a basis for describing many-body excitations. We analyze to which extend the natural orbitals describe both bound as well as i…