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MM: Fachverband Metall- und Materialphysik

MM 20: Electronic Properties II

MM 20.3: Vortrag

Dienstag, 26. Februar 2008, 10:45–11:00, H 0111

Fermiology of Cuprates and Non-Fermi Liquid Metallic Phases. — •Mukul Laad, Liviu Hozoi, and Peter Fulde — Max-Planck Institut fuer Physik komplexer Systeme, 38 Noethnitzer Strasse, 01187 Dresden, Germany

In the first step, we employ ab-initio wave-function based quantum chemical calculations to extract the effective hoppings for one hole/electron doped into a CuO2 plane. Strong, anisotropic, short-range spin correlations are found to drastically modify (bare) density-functional estimates of the hoppings. Remarkably, our results describe the detailed dispersion of the Zhang-Rice-like band (hole doping) as well as the unique evolution of both, hole- and electron-doped cuprates with quantitative accuracy. We discuss the implications of our findings for many, Fermi surface based, physical responses and their evolution in cuprates as a function of doping.

In the second step, we build upon these results to study the dynamical correlations in cuprates by incorporating these results in a new cluster dynamical mean field approximation. The physical mechanisms underlying the emergence of the unique non-Fermi liquid metallic phase(s) in cuprates will be detailed, and several response functions will be described in relation to experiments.