Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-05-22
Physical Review B 76 (2007) 161103(R)
Physics
Condensed Matter
Other Condensed Matter
Scientific paper
10.1103/PhysRevB.76.161103
We present calculations of the absorption spectrum of semiconductors and insulators comparing various approaches: (i) the two-particle Bethe-Salpeter equation of Many-Body Perturbation Theory; (ii) time-dependent density-functional theory using a recently developed kernel that was derived from the Bethe-Salpeter equation; (iii) a scheme that we propose in the present work and that allows one to derive different parameter-free approximations to (ii). We show that all methods reproduce the series of bound excitons in the gap of solid argon, as well as continuum excitons in semiconductors. This is even true for the simplest static approximation, which allows us to reformulate the equations in a way such that the scaling of the calculations with number of atoms equals the one of the Random Phase Approximation.
Marsili Marherita
Olevano Valerio
Reining Lucia
Sottile Francesco
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