论文标题
非热bcs-bec进化，具有复杂的散射长度
Non-Hermitian BCS-BEC evolution with a complex scattering length
论文作者
论文摘要
考虑到弹性和非弹性两体过程，其特征是复杂的$ s $波散射长度在$ \ uparrow $和$ \ downarrow $ fermions之间，在这里，我们将平均场理论的非弱点扩展应用于零温度下的BCS-bec Evolution。我们构建了系统的相图，在其中找到了一个由正常和/或亚稳态相处的重入超氟（SF）转变，这是增加非弹性性的函数。这种过渡发生在远离单位性的大参数状态下，即在共鸣的BCS和BEC侧面，并且主要受特殊点的控制。此外，除了强烈的弹性状态外，我们还表明，通过具有复杂结合能的两体结合状态下，弱相互互动的骨配对的凝结可以很好地描述。
Having both elastic and inelastic two-body processes that are characterized by a complex $s$-wave scattering length between $\uparrow$ and $\downarrow$ fermions in mind, here we apply the non-Hermitian extension of the mean-field theory to the BCS-BEC evolution at zero temperature. We construct the phase diagram of the system, where we find a reentrant superfluid (SF) transition that is intervened by a normal and/or a metastable phase as a function of increasing inelasticity. This transition occurs in a large parameter regime away from the unitarity, i.e., both on the BCS and BEC sides of the resonance, and it is mostly governed by the exceptional points. In addition, except for the strongly-inelastic regime, we also show that the SF phase can be well-described by the condensation of weakly-interacting bosonic pairs in the two-body bound state with a complex binding energy.
