Department of Applied Physics, P.O. Box 15100, 00076 Aalto University, Finland.
Phys Rev Lett. 2010 Jun 11;104(23):236402. doi: 10.1103/PhysRevLett.104.236402. Epub 2010 Jun 10.
In this Letter we consider a spin-imbalanced two-component attractive Fermi gas loaded in a 1D optical lattice in the presence of an harmonic confining potential. We propose that the observation of the change in the double occupancy with respect to a lattice depth modulation can provide clear evidence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. Simulating the time evolution of the system, we can characterize the double occupancy spectrum for different initial conditions. In particular, we numerically observe a striking narrowing of the width of the spectrum for increasing imbalance. Using Bethe-ansatz equations in the strongly interacting limit, we show that the width relates directly to the FFLO wave vector q.
在这封信件中，我们考虑了在存在谐波限制势的情况下，加载在一维光学晶格中的自旋不平衡双分量吸引费米气体。我们提出，观察双占据数相对于晶格深度调制的变化，可以为富勒-费雷尔-拉金-奥夫钦尼科夫（FFLO）相提供明确的证据。通过模拟系统的时间演化，我们可以针对不同的初始条件来描绘双占据数谱。特别地，我们数值上观察到随着非平衡度的增加，谱的宽度明显变窄。在强相互作用极限下使用 Bethe 方程，我们表明宽度与 FFLO 波矢 q 直接相关。
