Generic Optical Excitations of Correlated Systems: π-tons

A. Kauch, P. Pudleiner, K. Astleithner, P. Thunström, T. Ribic, and K. Held
Phys. Rev. Lett. 124, 047401 – Published 31 January 2020
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Abstract

The interaction of light with solids gives rise to new bosonic quasiparticles, with the exciton being—undoubtedly—the most famous of these polaritons. While excitons are the generic polaritons of semiconductors, we show that for strongly correlated systems another polariton is prevalent—originating from the dominant antiferromagnetic or charge density wave fluctuations in these systems. As these are usually associated with a wave vector (π,π,) or close to it, we propose to call the derived polaritons π-tons. These π-tons yield the leading vertex correction to the optical conductivity in all correlated models studied: the Hubbard, the extended Hubbard model, the Falicov-Kimball, and the Pariser-Parr-Pople model, both in the insulating and in the metallic phase.

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  • Received 16 February 2019
  • Revised 12 October 2019
  • Corrected 4 March 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.047401

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Corrections

4 March 2020

Correction: In the front matter, equal-contributor indicators were incorrectly ascribed; these indicators have now been assigned properly.

Authors & Affiliations

A. Kauch1,*, P. Pudleiner1,2,*, K. Astleithner1, P. Thunström3, T. Ribic1, and K. Held1

  • 1Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria
  • 2Institute of Theoretical and Computational Physics, Graz University of Technology, 8010 Graz, Austria
  • 3Department of Physics and Astronomy, Materials Theory, Uppsala University, 751 20 Uppsala, Sweden

  • *These authors contributed equally to this work.

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Issue

Vol. 124, Iss. 4 — 31 January 2020

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