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Journal of Physics and Chemistry of Solids

Continuous evolution of the 2D Hubbard model from an insulator to a metal

R. Preuss, R. Putz, Werner R. Hanke, Wolfgang von der Linden

Published Dec 1, 1995• 0 citations
Publisher
DOI
10.1016/0022-3697(95)00101-8

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On the basis of quantum Monte Carlo results the evolution of the spectral weight $A(\mathbf{k},\ensuremath{\omega})$ of the two-dimensional Hubbard model is studied from insulating to metallic behavior. As observed in recent photoemission experiments for cuprates, the electronic excitations display essentially doping-independent features; a quasiparticlelike dispersive narrow band of width of the order of the exchange interaction JJJ and a broad valence- and conduction-band background. The continuous evolution is traced back to one and the same many-body origin: the doping-dependent antiferromagnetic spin-spin correlation.