English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Kohn–Sham approach to quantum electrodynamical density-functional theory: Exact time-dependent effective potentials in real space

MPS-Authors
/persons/resource/persons45976

Flick,  Johannes
Theory, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons30964

Ruggenthaler,  Michael
Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science & Department of Physics, Luruper Chaussee 149, 22761 Hamburg, Germany;
Institut für Theoretische Physik, Universität Innsbruck, Technikerstraße 21A, A-6020 Innsbruck, Austria;

/persons/resource/persons21304

Appel,  Heiko
Theory, Fritz Haber Institute, Max Planck Society;
Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science & Department of Physics, Luruper Chaussee 149, 22761 Hamburg, Germany;

/persons/resource/persons22028

Rubio,  Angel
Theory, Fritz Haber Institute, Max Planck Society;
Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science & Department of Physics, Luruper Chaussee 149, 22761 Hamburg, Germany;
Nano-Bio Spectroscopy Group and ETSF, Dpto. Fisica de Materiales, Universidad del País Vasco, 20018 San Sebastián, Spain;

External Ressource
Fulltext (public)

1509.01069v1.pdf
(Preprint), 5MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Flick, J., Ruggenthaler, M., Appel, H., & Rubio, A. (2015). Kohn–Sham approach to quantum electrodynamical density-functional theory: Exact time-dependent effective potentials in real space. Proceedings of the National Academy of Sciences of the United States of America, 112(50), 15285-15290. doi:10.1073/pnas.1518224112.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-20A0-2
Abstract
The density-functional approach to quantum electrodynamics extends traditional density-functional theory and opens the possibility to describe electron–photon interactions in terms of effective Kohn–Sham potentials. In this work, we numerically construct the exact electron–photon Kohn–Sham potentials for a prototype system that consists of a trapped electron coupled to a quantized electromagnetic mode in an optical high-Q cavity. Although the effective current that acts on the photons is known explicitly, the exact effective potential that describes the forces exerted by the photons on the electrons is obtained from a fixed-point inversion scheme. This procedure allows us to uncover important beyond-mean-field features of the effective potential that mark the breakdown of classical light–matter interactions. We observe peak and step structures in the effective potentials, which can be attributed solely to the quantum nature of light; i.e., they are real-space signatures of the photons. Our findings show how the ubiquitous dipole interaction with a classical electromagnetic field has to be modified in real space to take the quantum nature of the electromagnetic field fully into account.