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Generic Optical Excitations of Correlated Systems: pi-tons
TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria.
TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria;Graz Univ Technol, Inst Theoret & Computat Phys, A-8010 Graz, Austria.
TU Wien, Inst Solid State Phys, A-1040 Vienna, Austria.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2020 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 124, no 4, article id 047401Article in journal (Refereed) Published
Abstract [en]

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 (pi, pi, ...) or close to it, we propose to call the derived polaritons pi-tons. These pi-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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2020. Vol. 124, no 4, article id 047401
National Category
Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-407302DOI: 10.1103/PhysRevLett.124.047401ISI: 000510393100021PubMedID: 32058776OAI: oai:DiVA.org:uu-407302DiVA, id: diva2:1416263
Funder
EU, FP7, Seventh Framework Programme, 306447Available from: 2020-03-23 Created: 2020-03-23 Last updated: 2020-03-23Bibliographically approved

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Thunström, Patrik

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