Absence of Unit-Cell Doubling in Nonmagnetic Insulator Phase on Two-Dimensional Lattice with Geometrical Frustration

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概要

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• The ground-state properties of the Hubbard model on the square lattice with nearest-neighbor and next-nearest-neighbor hoppings at half filling are studied by the path-integral-renormalization-group method. The nonmagnetic-insulator phase sandwiched by the paramagnetic-metal phase and the antiferromagnetic-insulator phase shows evidence against translational symmetry breaking of the dimerized state, plaquette singlet state, staggered flux state, and charge ordered state. These results support that the genuine Mott insulator which cannot be adiabatically continued to the band insulator is realized generically by Umklapp scattering through the effects of geometrical frustration and quantum fluctuation in the two-dimensional system.

• 社団法人日本物理学会の論文
• 2003-08-15

著者

• Watanabe Shinji

  Institute For Solid State Physics University Of Tokyo

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• Absence of Unit-Cell Doubling in Nonmagnetic Insulator Phase on Two-Dimensional Lattice with Geometrical Frustration
• Absence of Unit-Cell Doubling in Nonmagnetic Insulator Phase on Two-Dimensional Lattice with Geometrical Frustration

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