Density-wave and antiferromagnetic states of fermionic atoms in optical lattices

被引:3
|
作者
Higashiyama, Takuji [1 ]
Inaba, Kensuke [1 ]
Suga, Sei-ichiro [1 ]
机构
[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan
来源
PHYSICAL REVIEW A | 2009年 / 79卷 / 02期
关键词
antiferromagnetism; fermion systems; Hubbard model; magnetic transitions; optical lattices; INSULATOR;
D O I
10.1103/PhysRevA.79.023607
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We study two-band effects on ultracold fermionic atoms in optical lattices by means of dynamical mean-field theory. We find that at half filling an atomic-density-wave (ADW) state emerges owing to the two-band effects in the attractive interaction region, while an antiferromagnetic state appears in the repulsive interaction region. As the orbital splitting is increased, quantum phase transitions from the ADW state to the superfluid state and from the antiferromagnetic state to the metallic state occur in the corresponding regions. By systematically changing the orbital splitting and the interaction, we obtain the phase diagram at half filling. The results are discussed using the effective boson model derived for strong attractive interaction.
引用
收藏
页数:6
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