TY - JOUR
T1 - SU(3) Dirac electrons in the 15-depleted square-lattice Hubbard model at 14 filling
AU - Yamashita, Yasufumi
AU - Tomura, Masaki
AU - Yanagi, Yuki
AU - Ueda, Kazuo
PY - 2013/11/4
Y1 - 2013/11/4
N2 - We investigate the magnetic and metal-insulator (M-I) phase diagram of the 15-depleted square-lattice Hubbard model at 14 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 t1, intersquare hopping t2, 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 U-t1/t2 plane. When t1=t 2, we find that the Dirac cone and nearly flat band around the Γ 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.
AB - We investigate the magnetic and metal-insulator (M-I) phase diagram of the 15-depleted square-lattice Hubbard model at 14 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 t1, intersquare hopping t2, 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 U-t1/t2 plane. When t1=t 2, we find that the Dirac cone and nearly flat band around the Γ 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.
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U2 - 10.1103/PhysRevB.88.195104
DO - 10.1103/PhysRevB.88.195104
M3 - Article
AN - SCOPUS:84887544575
SN - 0163-1829
VL - 88
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 19
M1 - 195104
ER -