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Generic Optical Excitations of Correlated Systems: π-tons.

著者 Kauch A , Pudleiner P , Astleithner K , Thunström P , Ribic T , Held K
Phys Rev Lett.2020 Jan 31 ; 124(4):047401.
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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.
PMID: 32058776 [PubMed - in process]
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