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TT: Fachverband Tiefe Temperaturen

TT 38: Correlated Electrons: Low-dimensional Systems - Models 1

TT 38.7: Vortrag

Donnerstag, 26. März 2009, 11:15–11:30, HSZ 301

Disorder-induced stabilization of pseudogap in the electronic spectral density of the two-dimensional Anderson-Hubbard model — •Prabuddha Chakraborty^1,2, Simone Chiesa², Richard Scalettar², and Warren Pickett² — ¹Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — ²University of California, Davis, CA 95616, USA

In this talk, we present the observation of a pseudogap in the electronic spectral density in the two-dimensional Anderson-Hubbard model on a square lattice. We show the behaviour of the pseudogap when the electronic density, the disorder strength and the Hubbard correlation are varied. In particular, we show that the disorder stabilizes the pseudogap across a wide range of electron densities and correlation strengths. The numerical methods we use are exact diagonalization and Determinant quantum Monte Carlo. We also demonstrate that our observations are completely consistent with recent experimental results on disordered high temperature Cuprate superconductors.