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TT: Tiefe Temperaturen

TT 14: Postersitzung II: Korrelierte Systeme(1-40), Theorie der Supraleitung(41-50), Metall-Isolator-Übergang, Lokalisierung(51-66), Niederdimensionale Systeme, Quantenhalleffekt(67-80), Pinning, kritische Ströme und Vortexdynamik(81-93), HTSL-Drähte und -Bänder(94-98), Massive HTSL(99-104), supraleitende Borkarbide(105-109)

TT 14.16: Poster

Mittwoch, 19. März 1997, 15:00–18:30, Z1

Doping dependence of pseudogaps and magnetic excitations in the 2D Hubbard Model — •C. Gröber, W. Hanke, and R. Preuss — Institut für Theoretische Physik, Am Hubland, D-97074 Würzburg

On the basis of Qunatum-Monte-Carlo simulations in connection with Maximum-Entropy techniques for the spectral weight A (k^→,ω) and for the two-particle spin- and charge-response χ_s,c (q^→,ω) we find (a) the QMC data for the Hubbard model reproduce both the momentum (d_x²−y²–symmetry) and doping dependence of the pseudogap and (b) the dramactic doping dependence of the spin-response, which is sharp in both q^→ (≈(π,π)) and ω in the underdoped regime but broad and structureless otherwise, unambiguously identifies remnants of the antiferromagnetic order as the driving mechanism behind the pseudogap and its evolution with doping.