Ultracold fermions and the SU(N) Hubbard model -: art. no. 170403

被引：255

作者：

Honerkamp, C

Hofstetter, W

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] Harvard Univ, Lyman Lab Phys, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.92.170403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the fermionic SU(N) Hubbard model on the two-dimensional square lattice for weak to moderate interactions using renormalization group and mean-field methods. For the repulsive case U>0 at half filling and small N the dominant tendency is towards breaking of the SU(N) symmetry. For N>6 staggered flux order takes over as the dominant instability, in agreement with the large-N limit. Away from half filling for N=3 two flavors remain half filled by cannibalizing the third flavor. For U<0 and odd N a full Fermi surface coexists with a superconductor. These results may be relevant to future experiments with cold fermionic atoms in optical lattices.

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页码：170403 / 1

页数：4

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