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arXiv · 2501.08051

Strong coupling M{\o}ller-Plesset perturbation theory

Yassir El Moutaoukal·Rosario R. Riso·Matteo Castagnola·Enrico Ronca·Henrik Koch
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Abstract

Perturbative approaches are methods to efficiently tackle many-body problems, offering both intuitive insights and analysis of correlation effects. However, their application to systems where light and matter are strongly coupled is non-trivial. Specifically, the definition of suitable orbitals for the zeroth-order Hamiltonian represents a significant theoretical challenge. While reviewing previously investigated orbital choices, this work presents an alternative polaritonic orbital basis suitable for the strong coupling regime. We develop a quantum electrodynamical (QED) M{\o}ller-Plesset perturbation theory using orbitals obtained from the strong coupling QED Hartree-Fock. We assess the strengths and limitations of the different approaches and emphasize the essential role of using a consistent molecular orbital framework to achieve an accurate description of cavity-induced electron-photon correlation effects.

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Yassir El Moutaoukal, Rosario R. Riso, Matteo Castagnola, Enrico Ronca, Henrik Koch. 2025-01-14. Strong coupling M{\o}ller-Plesset perturbation theory. https://arxiv.org/abs/2501.08051

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