论文标题
一维自旋和质量受损的费米气体的配对模式
Pairing patterns in one-dimensional spin- and mass-imbalanced Fermi gases
论文作者
论文摘要
我们研究自旋的自旋和质量影响混合物 - $ \ tfrac {1} {2} $ fermions在一个空间维度中通过有吸引力的接触电势相互作用。具体而言，我们通过复杂的langevin方法解决了不等粒子质量对成对形成的影响。通过计算成对相关函数和相关的成对摩孔分布，我们发现所有研究的自旋极化和质量失衡都存在不均匀的配对。为了进一步表征配对行为，我们分析了动量空间中的密度密度相关性，即所谓的射击噪声，该噪声是通过飞行时间成像在实验上可以访问的。在有限的自旋极化下，已知后者在与Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）不稳定性相关的动量配置下显示出不同的最大值。除了那些最大值外，我们还发现当质量不平衡增加时，噪声相关性出现了其他特征，这揭示了FFLO型相关性与质量不平衡的稳定性并提供实验可访问的签名以探测这种类型的配对。
We study spin- and mass-imbalanced mixtures of spin-$\tfrac{1}{2}$ fermions interacting via an attractive contact potential in one spatial dimension. Specifically, we address the influence of unequal particle masses on the pair formation by means of the complex Langevin method. By computing the pair-correlation function and the associated pair-momentum distribution we find that inhomogeneous pairing is present for all studied spin polarizations and mass imbalances. To further characterize the pairing behavior, we analyze the density-density correlations in momentum space, the so-called shot noise, which is experimentally accessible through time-of-flight imaging. At finite spin polarization, the latter is known to show distinct maxima at momentum configurations associated with the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) instability. Besides those maxima, we find that additional features emerge in the noise correlations when mass imbalance is increased, revealing the stability of FFLO-type correlations against mass imbalance and furnishing an experimentally accessible signature to probe this type of pairing.
