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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 112: Correlated Electrons: (General) Theory 3

TT 112.2: Talk

Friday, March 20, 2015, 09:45–10:00, H 3010

Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion — •Erik van Loon1, Hartmut Hafermann2, Alexander Lichtenstein3,4, Rubtsov Alexey5,6, and Mikhail Katsnelson1,41Institute for Molecules and Materials, Radboud University Nijmegen, Nijmegen, The Netherlands — 2Institut de Physique Théorique, CEA, CNRS, Gif-sur-Yvette, France — 3Institut für Theoretische Physik, Universität Hamburg, Hamburg, Germany — 4Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Ekaterinburg, Russia — 5Department of Physics, Moscow State University, Moscow, Russia — 6Russian Quantum Center, Skolkovo, Russia

We study plasmons within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction. Strong correlations are taken into account using self-consistent extended dynamical mean-field theory. The polarization operator is determined in the ladder approximation, which includes non-local dynamical vertex corrections. This is necessary to fulfill charge conservation and to describe plasmons in the correlated state. The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical √q-behavior. Both features are reminiscent of interaction induced changes found in the single-electron spectra of strongly correlated systems.

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