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Related Experiment Video

Updated: May 25, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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Molecular properties via a subsystem density functional theory formulation: a common framework for electronic

Sebastian Höfener¹, André Severo Pereira Gomes, Lucas Visscher

¹Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands. s.hoefener@vu.nl

The Journal of Chemical Physics

|February 4, 2012

Summary

This summary is machine-generated.

This study presents a unified density functional theory (DFT) embedding method. It integrates wave-function theory-in-DFT and DFT-based subsystem response theory for accurate quantum chemical calculations.

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Area of Science:

Quantum Chemistry
Computational Chemistry
Theoretical Chemistry

Background:

Density Functional Theory (DFT) and Wave-Function Theory (WFT) are key computational methods.
Embedding methods are crucial for studying large molecular systems by dividing them into subsystems.
Existing methods like WFT-in-DFT and DFT-in-DFT have limitations in their unified application.

Purpose of the Study:

To derive a consistent DFT-based embedding method.
To unify WFT-in-DFT and DFT-in-DFT formulations.
To enable the use of non-variational WFT methods within DFT embedding.

Main Methods:

Utilizing a time-averaged quasi-energy formalism.
Employing variational Lagrangian techniques.
Developing a local potential for ground-state embedding in the time-independent limit.

Main Results:

A unified derivation of DFT-based embedding is presented.
Expressions for ground-state DFT-in-DFT and WFT-in-DFT embedding are obtained.
Working equations for coupled cluster embedding are provided.

Conclusions:

The developed method offers a consistent framework for DFT embedding.
It successfully integrates different theoretical approaches.
The method is demonstrated with a sample application, showing its practical utility.