Spectral properties of strongly correlated systems

Theo A. Costi, Alex C. Hewson

Francesco Rizzo, E. Cappelluti, L. Pietronero

Several studies have so far investigated transport properties of strongly correlated systems. Interesting features of these materials are the lack of resistivity saturation well beyond the Mott-Ioffe-Regel limit and the scaling of the resistivity with the hole density in underdoped cuprates. Due to the strongly correlated nature of these materials, mainly numerical techniques have been employed. A key role in this regard is thought to be played by the continuous transfer of spectral weight from coherent to incoherent states. In this paper we employ a simple analytical expression for the electronic Green's function to evaluate both quasiparticle and transport properties in correlated systems. Our analytical approach permits us to enlighten the specific role of the spectral transfer due to the correlation on different features. In particular we investigate the dependence of both quasiparticle and transport scattering rate on the correlation degree and the criterion for resistivity saturation.

Jaromir Panas, Anna Kauch, Krzysztof Byczuk

We use the Bose-Hubbard model with an effective infinite-range interaction to describe the correlated lattice bosons in an optical cavity. We study both static and spectral properties of such system within the bosonic dynamical mean-field theory, which is the state-of-the-art method for strongly correlated bosonic systems. Both similarities and differences are found and discussed between our results and those obtained within different theoretical methods and experiment.

Rishabh Jha

Sergei G. Ovchinnikov, Valerii Vladimirovich Val'kov

Hubbard Model as the Simplest Model of Strong Electron Correlation Multielectron Models in X-Operators Representation General Approach to the Quasiparticle Description of Strongly Correlated Systems Unitary Transformations Method in Atomic Representation Diagram Technique in the X-Operators Representation Spectral Properties of the Anisotropic Metallic Ferromagnets Peculiarities of the de Haas-van Alphen Effect in Strongly Correlated Systems with Magnetic Polaron States The Electronic Structure of Copper Oxides in the Multiorbital p-d Model

Thomas Pruschke, Th. Obermeier, J. Keller +1 more