title: Phases of the infinite U Hubbard model on square lattices.
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.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.forename: Hong
authors.initials: H
authors.lastname: Yao
authors.forename: Erez
authors.initials: E
authors.lastname: Berg
authors.forename: Steven R
authors.initials: SR
authors.lastname: White
authors.forename: Steven A
authors.initials: SA
authors.lastname: Kivelson