Mott transition in quasi-one-dimensional systems

Article

关键词: ANTIFERROMAGNETIC HEISENBERG CHAIN;    LONG-RANGE ORDER;    HUBBARD-MODEL;    MONTE-CARLO;    HALDANE-GAP;    LATTICE;   

DOI  :  10.1103/PhysRevB.84.193103

来源: SCIE

【 摘 要 】

We report the application of the density-matrix renormalization-group method to a spatially anisotropic two-dimensional Hubbard model at half filling. We find a deconfinement transition induced by the transverse hopping parameter t(y) from an insulator to a metal. Therefore, if t(y) is fixed in the metallic phase, increasing the interaction U leads to a metal-to-insulator transition at a finite critical U. This is in contrast to the weak-coupling Hartree-Fock theory which predicts a nesting-induced antiferromagnetic insulator for any U > 0.

【 授权许可】

Free