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  Light-Matter Response Functions in Quantum-Electrodynamical Density-Functional Theory: Modifications of Spectra and of the Maxwell Equations

Flick, J., Welakuh, D., Ruggenthaler, M., Appel, H., & Rubio, A. (2018). Light-Matter Response Functions in Quantum-Electrodynamical Density-Functional Theory: Modifications of Spectra and of the Maxwell Equations.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B25A-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A34F-D
Genre: Paper

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1803.02519.pdf (Preprint), 3MB
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1803.02519.pdf
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File downloaded from arxiv.org: 2018-07-13
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https://arxiv.org/abs/1803.02519 (Preprint)
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 Creators:
Flick, J.1, 2, 3, Author              
Welakuh, D.1, 2, Author              
Ruggenthaler, M.1, 2, Author              
Appel, H.1, 2, Author              
Rubio, A.1, 2, 4, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free-Electron Laser Science, ou_persistent22              
3ohn A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, ou_persistent22              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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 Abstract: We introduce linear-response theory for non-relativistic quantum-electrodynamics in the long wavelength limit, which allows us to treat correlated excited-state phenomena of matter-photon systems from first principles. By using quantum-electrodynamical density-functional theory we can reformulate the resulting fully coupled photon-matter response equations as a pseudo-eigenvalue problem. This provides a direct extension of the conventional matter-only response theory. Our approach can be solved numerically very efficiently and existing ab-initio density-functional response implementations can be easily extended to take the full photon-matter response into account. We highlight how the coupling between light and matter changes the usual response functions and introduces new types of response functions that measure the matter-photon subsystem responses. We show how correlating light and matter changes the Maxwell equations and highlight how the spectra of real systems are changed upon strongly coupling to the photon field. A key feature of treating the combined matter-photon response is that natural lifetimes of excitations become directly accessible from first principles and no artificial broadening of spectra is required anymore. By introducing a straightforward extension of the random-phase approximation for the coupled matter-photon problem, we are able to present the first ab-initio spectra for a real molecular system that is coupled to the quantized electromagnetic field.

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Language(s): eng - English
 Dates: 2018-03-072018-03-08
 Publication Status: Published online
 Pages: 27
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1803.02519
 Degree: -

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