Unconventional spin-density waves in dipolar Fermi gases

被引:15
|
作者
Bhongale, S. G. [1 ,5 ,6 ]
Mathey, L. [2 ,3 ]
Tsai, Shan-Wen [4 ]
Clark, Charles W. [5 ,6 ]
Zhao, Erhai [1 ,5 ,6 ]
机构
[1] George Mason Univ, Sch Phys Astron & Computat Sci, Fairfax, VA 22030 USA
[2] Univ Hamburg, Zentrum Opt Quantentechnol, D-22761 Hamburg, Germany
[3] Univ Hamburg, Inst Laserphys, D-22761 Hamburg, Germany
[4] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA
[5] NIST, Joint Quantum Inst, Gaithersburg, MD 20899 USA
[6] Univ Maryland, Gaithersburg, MD 20899 USA
来源
PHYSICAL REVIEW A | 2013年 / 87卷 / 04期
基金
美国国家科学基金会;
关键词
RENORMALIZATION-GROUP APPROACH; LATTICE;
D O I
10.1103/PhysRevA.87.043604
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We show that unconventional spin order arises naturally in two-component dipolar Fermi gases of atoms or molecules, which recently became accessible experimentally, in optical lattices. Using an unbiased functional renormalization-group analysis, we find that dipolar interactions lead to an instability of the gas toward an l = 1 spin-density wave state. This phase is the particle-hole analog of spin-triplet, p-wave Cooper pairs. The order parameter for such spin-density waves of p-wave orbital symmetry is a vector in spin space and, moreover, is defined on lattice bonds rather than on lattice sites. We determine the rich quantum phase diagram of dipolar fermions at half filling on the square lattice as a function of the dipolar orientation and discuss how these exotic spin-density waves emerge amidst competition with superfluid and charge-density wave phases. DOI: 10.1103/PhysRevA.87.043604
引用
收藏
页数:5
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