Gutzwiller magnetic phase diagram of the undoped t-t?-U Hubbard model (Articolo in rivista)

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  • Gutzwiller magnetic phase diagram of the undoped t-t?-U Hubbard model (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.81.014510 (literal)
Alternative label
  • R.S. Markiewicz (1,2,3); J. Lorenzana (2,3); G. Seibold (4) (2010)
    Gutzwiller magnetic phase diagram of the undoped t-t?-U Hubbard model
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • R.S. Markiewicz (1,2,3); J. Lorenzana (2,3); G. Seibold (4) (literal)
Pagina inizio
  • 014510 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.81.014510 (literal)
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  • 81 (literal)
Rivista
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  • American Physical Society. (literal)
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  • 6 (literal)
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  • 1 (literal)
Note
  • Scopu (literal)
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  • (1) Physics Department, Northeastern University, Boston, Massachusetts 02115, USA (2) SMC-INFM-CNR and Dipartimento di Fisica, Università di Roma \"La Sapienza,\" Piazzale Aldo Moro 2, 00185 Roma, Italy (3) ISC-CNR, Via dei Taurini 19, I-00185 Roma, Italy (4) Institut für Physik, BTU Cottbus, P.O. Box 101344, 03013 Cottbus, Germany (literal)
Titolo
  • Gutzwiller magnetic phase diagram of the undoped t-t?-U Hubbard model (literal)
Abstract
  • We calculate the magnetic phase diagram of the half-filled t-t?-U Hubbard model as a function of t? and U, within the Gutzwiller approximation plus random-phase approximation. As U increases, the system first crosses over to one of a wide variety of incommensurate phases, whose origin is clarified in terms of double nesting. We evaluate the stability regime of the incommensurate phases by allowing for symmetry breaking with regard to the formation of spin spirals, and find a crossover to commensurate phases as U increases and a full gap opens. The results are compared with a variety of other recent calculations, and in general good agreement is found. For parameters appropriate to the cuprates, double occupancy should be only mildly suppressed in the absence of magnetic order, inconsistent with a strong-coupling scenario. (literal)
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