"Phases of the Infinite U Hubbard Model on Square Lattices"

Li Liu: Hong Yao, Erez Berg, Steven R. White, and Steven A. Kivelson ; Phys. Rev. Lett., 03/22/12.

Additional Authors: Hong Yao, Erez Berg, Steven R. White, and Steven A. Kivelson

Abstract:

We apply the density matrix renormalization group to study the phase diagram of the infinite U Hubbard model on 2- to 6-leg ladders. Where the results are largely insensitive to the ladder width, we consider the results representative of the 2D square lattice. We find a fully polarized ferromagnetic Fermi liquid phase when n, the density of electrons per site, is in the range 1>n≳0.800. For n=3/4 we find an unexpected insulating checkerboard phase with coexisting bond-density order with 4 sites per unit cell and block-spin antiferromagnetic order with 8 sites per unit cell. For 3/4>n, all ladders with width >2 have unpolarized ground states.