Dresden 2009 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 24: Correlated Electrons: (General) Theory 2

TT 24.10: Vortrag

Mittwoch, 25. März 2009, 12:15–12:30, HSZ 301

Pseudogap phase in hole-doped high-temperature superconductors — •Steffen Sykora and Klaus W. Becker — Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden

One of the most important unsolved problems in the understanding of copper-oxide superconductors is the pseudogap phase which is a most unusual state of matter. ARPES experiments have revealed a gap-like behavior on parts of the Fermi surface, leaving a non gapped segment known as Fermi arc around the diagonal of the Brillouin zone. Two main interpretations of the origin of the pseudogap have been proposed: either the pseudogap is a precursor to superconductivity, or it arises from another order competing with superconductivity. In this paper, the pseudogap phase is investigated in the framework of a novel renormalization scheme. We present results for the one-particle spectral function A_k(ω) near the Fermi level for different values of wave vector k, doping and temperature. The results show an excellent agreement with recently puplished ARPES measurements. The origin of the pseudogap will be discussed.