Quantum chemical methods for the description of molecular polaritonic states in the strong coupling regime based on the Pauli–Fierz Hamiltonian are introduced. Based on a quantum electrodynamic Hartree–Fock (QED-HF) reference, a QED Møller–Plesset perturbation theory of second order for the electronic ground state and a second order quantum electrodynamic algebraic diagrammatic construction scheme for the polarization propagator [QED-ADC(2)] for excited electronic states have been derived, implemented, and tested for polaritons in hydrogen fluoride. Analogous approaches based on a standard non-polaritonic HF reference are also presented and thoroughly compared, both algebraically and numerically, to those based on the QED-HF reference. Furthermore, a promising route to approximate QED-ADC methods based on a unitary transformation of the algebraic expression into a restricted state space is outlined showing excellent agreement in second order with QED-ADC(2). All presented novel methods are compared to and tested against other existing ab initio approaches, mostly QED coupled cluster theory, including single and double excitations, and show qualitative agreement at a reduced computational effort.
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28 March 2023
Research Article|
March 31 2023
Perturbation theoretical approaches to strong light–matter coupling in ground and excited electronic states for the description of molecular polaritons
Marco Bauer
;
Marco Bauer
a)
(Data curation, Formal analysis, Investigation, Methodology, Software, Writing – original draft, Writing – review & editing)
Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University
, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
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Andreas Dreuw
Andreas Dreuw
b)
(Conceptualization, Funding acquisition, Project administration, Supervision, Writing – original draft, Writing – review & editing)
Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University
, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
b)Author to whom correspondence should be addressed: [email protected]
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b)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 158, 124128 (2023)
Article history
Received:
January 13 2023
Accepted:
March 15 2023
Citation
Marco Bauer, Andreas Dreuw; Perturbation theoretical approaches to strong light–matter coupling in ground and excited electronic states for the description of molecular polaritons. J. Chem. Phys. 28 March 2023; 158 (12): 124128. https://doi.org/10.1063/5.0142403
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