Excited-state Forces within a First-principles Green's Function Formalism

Details Excited-state Forces within a First-principles Green's Function Formalism Excited-state Forces within a First-principles Green's Function Formalism

2002-07-10

arxiv.org/abs/cond-mat/0207248v3

Physics

Condensed Matter

Materials Science

2 figures and 2 tables

Scientific paper

We present a new first-principles formalism for calculating forces for optically excited electronic states using the interacting Green's function approach with the GW-Bethe Salpeter Equation method. This advance allows for efficient computation of gradients of the excited-state Born-Oppenheimer energy, allowing for the study of relaxation, molecular dynamics, and photoluminescence of excited states. The approach is tested on photoexcited carbon dioxide and ammonia molecules, and the calculations accurately describe the excitation energies and photoinduced structural deformations.

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