26 citations · 54 across the 6 of their papers we have counts for
9 papers
Static and Dynamic Bethe-Salpeter Equations in the -Matrix Approximation
Pierre-François Loos, Pina Romaniello
While the well-established approximation corresponds to a resummation of the direct ring diagrams and is particularly well suited for weakly-correlated systems, the -matrix…
Scrutinizing -based methods using the Hubbard dimer
Stefano Di Sabatino, Pierre-François Loos, Pina Romaniello
Using the simple (symmetric) Hubbard dimer, we analyze some important features of the approximation. We show that the problem of the existence of multiple quasiparticle soluti…
Photoemission spectra from the Extended Koopman's Theorem, revisited
S. Di Sabatino, J. Koskelo, J. Prodhon +3
The Extended Koopman's Theorem (EKT) provides a straightforward way to compute charged excitations from any level of theory. In this work we make the link with the many-body effect…
Optical spectra of 2D monolayers from time-dependent density functional theory
Stefano Di Sabatino, J. A. Berger, Pina Romaniello
The optical spectra of two-dimensional (2D) periodic systems provide a challenge for time-dependent density-functional theory (TDDFT) because of the large excitonic effects in thes…
Accurate optical spectra of solids from pure time-dependent density-functional theory
Sarah Cavo, J. A. Berger, Pina Romaniello
We present accurate optical spectra of semiconductors and insulators within a pure Kohn-Sham time-dependent density-functional approach. In particular, we show that the onset of th…
Many-Body Effective Energy Theory: photoemission at strong correlation
S. Di Sabatino, J. A. Berger, P. Romaniello
In this work we explore the performance of a recently derived many-body effective energy theory for the calculation of photoemission spectra in the regime of strong electron correl…