Linear and Nonlinear Optical Properties of Molecules from Real-Time Propagation Based on the Bethe-Salpeter Equation.

ABSTRACT: We present a real-time propagation method for computing linear and nonlinear optical properties of molecules based on the Bethe-Salpeter equation. The method follows the time evolution of the one-particle density matrix under an external electric field. We include electron-electron interaction effects through a self-energy model based on the screened exchange approximation. Quasiparticle energies are taken from a prior GW calculation to construct the effective single-particle Hamiltonian, and we represent all operators and wave functions in an atom-centered Gaussian basis. We benchmark the accuracy of the real-time propagation against the standard linear-response Bethe-Salpeter equation by using a set of organic molecules. We find very good agreement when computing linear-response i

SUBMITTER: Marek S 

PROVIDER: S-EPMC12529910 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature