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• W1998135763 endingPage "084705" @default.
• W1998135763 startingPage "084705" @default.
• W1998135763 abstract "The mechanism of Mott transition in the Hubbard model on a square lattice is studied without the explicit introduction of magnetic and superconducting correlations, using a variational Monte Carlo method. In trial wave functions, we consider various types of binding factors between a doubly occupied site (doublon, D) and an empty site (holon, H), like a long-range type as well as a conventional nearest-neighbor type, and add independent long-range D–D (H–H) factors. It is found that a wide choice of D–H binding factors leads to Mott transitions near the bandwidth. We modify the previous the D–H binding picture of Mott transitions by introducing two characteristic length scales, the D–H binding length ℓ DH and the minimum D–D distance ℓ DD , which we appropriately estimate. A Mott transition takes place at ℓ DH = ℓ DD . In the metallic regime (ℓ DH > ℓ DD ), the domains of D–H pairs overlap with one another, thereby doublons and holons can move independently by changing their partners one after another. In contrast, the D–D factors give only a minor contribution to a Mott transition." @default.
• W1998135763 created "2016-06-24" @default.
• W1998135763 creator A5046700087 @default.
• W1998135763 creator A5090508237 @default.
• W1998135763 date "2011-08-15" @default.
• W1998135763 modified "2023-09-23" @default.
• W1998135763 title "Effects of Long-Range Correlations on Nonmagnetic Mott Transitions in Hubbard Model on Square Lattice" @default.
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• W1998135763 doi "https://doi.org/10.1143/jpsj.80.084705" @default.
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