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• W2897850423 abstract "We present a novel solution of the 2D Hubbard model in the framework of the Composite Operator Method within a four-pole approximation. We adopt a basis of four fields: the two Hubbard operators plus two fields describing the Hubbard transitions dressed by nearest-neighbor spin fluctuations. We include these nonlocal operators because spin fluctuations play a dominant role in strongly correlated electronic systems with respect to other types of nonlocal charge, pair and double-occupancy fluctuations. The approximate solution performs very well once compared with advanced (semi-) numerical methods from the weak-to the strong-coupling regime, being by far less computational-resource demanding. We adopt this solution to study the single-particle properties of the model in the strong coupling regime, where the effects of strong short-range magnetic correlations are more relevant and could be responsible for anomalous features. In particular, we will focus on the characterization of the Fermi surface and of its evolution with doping." @default.
• W2897850423 created "2018-10-26" @default.
• W2897850423 creator A5032956043 @default.
• W2897850423 creator A5042066891 @default.
• W2897850423 date "2018-10-01" @default.
• W2897850423 modified "2023-09-27" @default.
• W2897850423 title "Fermi surface evolution of the 2D Hubbard model within a novel four-pole approximation" @default.
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• W2897850423 doi "https://doi.org/10.1063/1.5042831" @default.
• W2897850423 hasPublicationYear "2018" @default.
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