Generic Optical Excitations of Correlated Systems: π -tons

A. Kauch*, P. Pudleiner, K. Astleithner, P. Thunström, T. Ribic, K. Held

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number047401
JournalPhysical Review Letters
Issue number4
Publication statusPublished - 31 Jan 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Generic Optical Excitations of Correlated Systems: π -tons'. Together they form a unique fingerprint.

Cite this