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Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal

R. Preuss·W. von der Linden·W. Hanke
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Abstract

On the basis of Quantum-Monte-Carlo results the evolution of the spectral weight $A(\vec k, ω)$ 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 quasiparticle-like dispersive narrow band of width of the order of the exchange interaction $J$ 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.

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R. Preuss, W. von der Linden, W. Hanke. 1994-12-20. Quasiparticle Dispersion of the 2D Hubbard Model: From an Insulator to a Metal. https://doi.org/10.1103/physrevlett.75.1344

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