论文标题
Fulde-Ferrell国家在不等的费米气体中
Fulde-Ferrell states in unequally charged Fermi gases
论文作者
论文摘要
具有不同内部状态的原子可以表现出对人造磁场的不同反应。因此，两个不同组分的原子气体混合物可以解释为携带不同合成电荷的两种原子气体的混合物。我们考虑了通过轨道效应与磁场耦合并将其捕获在圆环几何形状中的磁场的超级流体状态。与磁场的轨道耦合有利于最佳的质量中心动量配对的不均匀超流体状态。所得的人群平衡的轨道Fulde-Ferrell（FF）状态对磁场具有鲁棒性，并且与传统的BC和Fulde-ferrell-Larkin-ovchinnikov型配对状态不同，在Zeeman效应下，不会经历一对破裂。我们将同质和不均匀的案例对比，强调了不等的系统的优势并呈现其动量分布。我们得出的结论是，与人工磁场旋转的不等性原子费米气体系统为FF状态实现实验性提供了理想的候选。
Atoms with different internal states can exhibit different responses to an artificial magnetic field. An atomic gas mixture of two different components can therefore be interpreted as a mixture of two atomic gases carrying different synthetic charges. We consider the superfluid state of such unequally charged Fermi gases coupled to a magnetic field via the orbital effect and trapped in a torus geometry. The orbital coupling to the magnetic field favors an inhomogeneous superfluid state with optimum finite center-of-mass momentum pairing. The resulting population-balanced orbital Fulde-Ferrell (FF) state is robust against the magnetic field and does not undergo pair breaking unlike the conventional BCS and Fulde-Ferrell-Larkin-Ovchinnikov type pairing states under the Zeeman effect. We contrast the homogeneous and inhomogeneous cases emphasizing the advantages of the unequally charged systems and present their momentum distributions. We conclude that an unequally charged atomic Fermi gas system orbitally coupled to an artificial magnetic field provides an ideal candidate for experimental realization of the FF state.
