Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 150, Issue 20, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.5094244
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Funding
- Deutsche Forschungsgemeinschaft (DFG) through the Priority Programme SPP 1807 [KL 721/5-2]
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We have implemented and applied the GW method and the static screened Bethe-Salpeter equation (BSE) for calculating linear-response properties for quasirelativistic molecular systems. Our ansatz is based on a two-component (2c) scheme that includes spin-orbit coupling as well as scalar relativistic effects. Efficient, state-of-the-art approaches including the analytic continuation (employing Pade approximants, scaling as N-4 with system size N) and contour deformation schemes are presented to obtain the required 2c quasirelativistic G W quasiparticle energies. Screened exchange contributions are computed within the resolution-of-the-identity approximation, and working equations for the 2c GW/BSE method are given. The performance of the 2c GW/BSE method is assessed, and results are compared to other methods and experimental data. A robust iterative scheme for solving the eigenvalue problems occurring in the 2c GW/BSE and hybrid time-dependent density functional theories is presented. Published under license by AIP Publishing.
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