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• W1968892728 abstract "We investigate the magnetic and metal-insulator (M-I) phase diagram of the $frac{1}{5}$-depleted square-lattice Hubbard model at $frac{1}{4}$ filling by the mean-field approximation. There exist three magnetic phases of nonmagnetic (N), antiferromagnetic (AF), and ferromagnetic (F) types, each realized for the large intrasquare hopping ${t}_{1}$, intersquare hopping ${t}_{2}$, and Coulomb interaction $U$, respectively. Within each magnetic phase, the M-I transition of Lifshitz type emerges and, finally, six kinds of phases are identified in the $Uensuremath{-}{t}_{1}/{t}_{2}$ plane. When ${t}_{1}={t}_{2}$, we find that the Dirac cone and nearly flat band around the $ensuremath{Gamma}$ point form the SU(3) multiplet. The SU(3) effective theory well describes the phase transitions between NI, paramagnetic-metal (PM), and AF phases. The NI and AFI phases are characterized by different Berry phases as in polyacetylene or graphene." @default.
• W1968892728 created "2016-06-24" @default.
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• W1968892728 date "2013-11-04" @default.
• W1968892728 modified "2023-10-16" @default.
• W1968892728 title "SU(3) Dirac electrons in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mfrac><mml:mn>1</mml:mn><mml:mn>5</mml:mn></mml:mfrac></mml:math>-depleted square-lattice Hubbard model at<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mfrac><mml:mn>1</mml:mn><mml:mn>4</mml:mn></mml:mfrac></mml:math>filling" @default.
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• W1968892728 doi "https://doi.org/10.1103/physrevb.88.195104" @default.
• W1968892728 hasPublicationYear "2013" @default.
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