Phases of the Infinite U Hubbard Model on Square Lattices

被引：67

作者：

Liu, Li ^{[1
]}

Yao, Hong ^{[2
,3
]}

Berg, Erez ^{[4
]}

White, Steven R. ^{[5
]}

Kivelson, Steven A. ^{[1
]}

机构：

[1] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[4] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[5] Univ Calif Irvine, Dept Phys, Irvine, CA 92697 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 12期

基金：

美国国家科学基金会;

关键词：

FERROMAGNETISM; NARROW; STATE;

D O I：

10.1103/PhysRevLett.108.126406

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 greater than or similar to 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.

引用

页数：4

共 23 条

[1] Nagaoka ferromagnetism in the two-dimensional infinite-U Hubbard model [J].