Continuous Mott Transition in a Two-Dimensional Hubbard Model

Abstract

We investigate nonmagnetic metal-insulator transition in the 1/5-depleted square lattice Hubbard model at half-filling within the 8-site cellular dynamical mean field theory. We find that a metal-insulator transition without any signatures of the first order transition, a continuous Mott transition, takes place in a certain range of parameters. The nature of the continuous Mott transition is nothing but a Lifshitz transition driven by the on-site Coulomb interaction. The renormalized matrix elements of hoppings and the spin-spin correlation functions reveal that physics of this transition is strong enhancement of the dimerization due to the non-local effects of electron-electron interaction.

6 pages, 6 figures, text and figures have been revised, published in Phys. Rev. B

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• Single-orbital realization of high-temperature $s^{\pm }$ superconductivity in the square-octagon lattice
• Magnetic correlations and pairing in the 1/5-depleted square lattice Hubbard model
• Multiple insulating phases due to the interplay of strong correlations and lattice geometry in a single-orbital Hubbard model
• Direct observation of fragile Mott insulators on plaquette Hubbard lattices
• Magnetic phase diagram and Mott transition of the half-filled 1/5-depleted Hubbard model with frustration
• Universal Mott quantum criticality in a modified periodic Anderson model