论文标题
Zeeman Field带来的有限动量冷凝物
Finite momentum condensate brought on by Zeeman field
论文作者
论文摘要
我们在二维费米子有吸引力的哈伯德模型中研究超流体状态，并与Zeeman耦合到外场。我们将注意力集中在弱耦合方案和强耦合方案中的单线配对上，我们揭示了有限动量冷凝水的丰富相图，该图在零温度下表现出Fulde-Ferrell和Larkin-Ovchinnikov的订单。后者是自发打破晶格对称性的相应条纹。发现许多稳定的订购波频是粒子密度和Zeeman场的函数。更强的耦合显着增强了有限动量冷凝物的稳定性，但是我们的数值平均场计算低估了波动的效果，并表明可能近半填充的定位。
We study superfluid states in a two-dimensional fermionic attractive Hubbard model with Zeeman coupling to an external field. Focusing our attention on singlet pairing in both weak and strong coupling regimes, we reveal a rich phase diagram of finite momentum condensates which exhibits both Fulde-Ferrell and Larkin-Ovchinnikov orders at zero temperature. The latter are commensurate stripe states that spontaneously break a lattice symmetry; many stable ordering wavevectors are found as a function of particle density and Zeeman field. Stronger coupling significantly enhances the stability of the finite momentum condensates, but our numerical mean-field calculations underestimate the effect of fluctuations and indicate a possible localization near half-filling.
