First-principles GW-BSE excitations in organic molecules

Abstract

We present a first-principles method for the calculation of optical excitations in nanosystems. The method is based on solving the Bethe-Salpeter equation (BSE) for neutral excitations. The electron self-energy is evaluated within the GW approximation, with dynamical screening effects described within time-dependent density-functional theory in the adiabatic, local approximation. This method is applied to two systems: the benzene molecule, C${}_6$H${}_6$, and azobenzene, C${}_{12}$H${}_{10}$N${}_2$. We give a description of the photoisomerization process of azobenzene after an $n-{\pi }^{\star }$ excitation, which is consistent with multi-configuration calculations.

References in corpus (1)

• Quasiparticle energies for large molecules: a tight-binding GW approach

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