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Recent Progress in Many-Body Theories

The Two-Dimensional Hubbard Model: Numerical Evaluation of the Properties of Projected Antiferromagnetic and Superconducting Wavefunctions

Claudius Gros, Thomas Maurice Rice, Robert Joynt

Published Jan 1, 1988• 0 citations
Publisher
DOI
10.1007/978-1-4613-0973-4_8

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A microscopic theory of electronic spectrum and superconducting pairing within the Hubbard model is formulated.The Dyson equation for the normal and anomalous Green functions in terms of the Hubbard operators is derived by applying the Mori-type projection technique.The self-energy is evaluated in the noncrossing approximation for electron scattering on spin and charge fluctuations induced by kinematic interaction for Hubbard operators.Numerical results for electron dispersion in the strong correlation limit are presented.Superconducting pairing mediated by antiferromagnetic exchange and spin fluctuations is discussed.