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  Reduced Density-Matrix Approach to Strong Matter-Photon Interaction

Buchholz, F., Theophilou, I., Nielsen, S. E. B., Ruggenthaler, M., & Rubio, A. (2018). Reduced Density-Matrix Approach to Strong Matter-Photon Interaction.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-A01F-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A38E-5
Genre: Paper

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1812.05562.pdf (Preprint), 2MB
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2018
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https://arxiv.org/abs/1812.05562 (Preprint)
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 Creators:
Buchholz, F.1, Author              
Theophilou, I.1, Author              
Nielsen, S. E. B.1, Author              
Ruggenthaler, M.1, Author              
Rubio, A.1, 2, Author              
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Computational Quantum Physics (CCQ), Flatiron Institute, ou_persistent22              

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 Abstract: In this work, we present a first-principles approach to electronic many-body systems strongly coupled to cavity modes in terms of matter-photon reduced density matrices. The theory is fundamentally non-perturbative and thus captures not only the effects of correlated electronic systems but accounts also for strong interactions between matter and photon egrees of freedom. We do so by introducing a higher-dimensional auxiliary system that maps the coupled fermion-boson system to a purely fermionic problem as proposed recently in the context of density-functional theory (arXiv:1812.00388(N)). This reformulation allows us to overcome many fundamental challenges of density-matrix theory in the context of coupled fermion-boson systems and we can employ conventional reduced density-matrix functional theory developed for purely fermionic systems. We provide results for model systems in real space and show that simple density-matrix approximations are accurate from the weak to the deep-strong coupling regime.

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Language(s): eng - English
 Dates: 2018-12-13
 Publication Status: Published online
 Pages: 39
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1812.05562
 Degree: -

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