Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-19
J. Phys. Soc. Jpn. 75, 114706 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 30 figures
Scientific paper
10.1143/JPSJ.75.114706
Mechanisms of Mott transitions and dx2-y2-wave superconductivity (SC) are studied in the half-filled-band Hubbard model on square lattices with a diagonal hopping term (t'), using an optimization (or correlated) variational Monte Carlo method. In the trial wave functions, a doublon-holon binding effect is introduced in addition to the onsite Gutzwiller projection. We mainly treat a d-wave singlet state and a projected Fermi sea. In both wave functions, first-order Mott transitions without direct relevance to magnetic orders take place at U=Uc approximately of the bandwidth for arbitrary t'/t. These transitions originate in the binding or unbinding of a doublon to a holon. d-wave SC appears in a narrow range immediately below Uc. The robust d-wave superconducting correlation are necessarily accompanied by enhanced antiferromagnetic correlation; the strength of SC becomes weak, as t'/t increases.
Ogata Masao
Tanaka Yukio
Yokoyama Hisatoshi
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