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Andrei E. Ruckenstein
Researcher at University of California, San Diego
Publications - 18
Citations - 1621
Andrei E. Ruckenstein is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Hubbard model & Mean field theory. The author has an hindex of 11, co-authored 18 publications receiving 1528 citations.
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New functional integral approach to strongly correlated Fermi systems: The Gutzwiller approximation as a saddle point.
TL;DR: This approach uncovers the limitations of the Gutzwiller approximation and clarifies its connection to the "auxiliary-boson" mean- field theory of the Anderson model, leading to a novel strong-coupling mean-field theory which allows for a unified treatment of antiferromagnetism and ferromagnets, metal-to-insulator transition, and Kondo compensation effects.
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Spectral Function of Holes in a Quantum Antiferromagnet
TL;DR: La fonction spectrale du trou est calculee avec un hamiltonien de spin effectif tenant compte des contraintes sur le mouvement du trou dans un antiferromagnetique quantique.
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Mean-field theory of high-T c superconductivity: The superexchange mechanism
TL;DR: In this paper, the authors developed the simplest mean field theory of an extended Hubbard model in the limit of a large intrasite Coulomb interaction, concentrating on the possibility of superconductivity induced by the superexchange interaction and weakened by the intersite Coulomb repulsion.
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Many-body aspects of the optical spectra of bulk and low-dimensional doped semiconductors
TL;DR: The many-body aspects of the optical spectra of doped semiconductors, for both bulk and low-dimensional systems, are discussed, in terms of Fadeev-like equations, which describe up to three-particle correlations exactly.
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Coexistence of antiferromagnetism and superconductivity in a mean-field theory of high-T c superconductors
TL;DR: A mean-field theory of the Hubbard model is investigated in the large on-site correlation limit, allowing for the possibility of a commensurate spin-density wave together with s- and d-wave-like superconductivity.