Rashba自旋轨道耦合费米气体中超流性的非厄米工程
Non-Hermitian engineering of superfluidity in a Rashba spin-orbit-coupled Fermi gas
- Institute for Quantum Science and Technology, Shanghai University（上海大学量子科学与技术研究院）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过非厄米平均场方法，发现自旋选择性耗散可显著增强Rashba自旋轨道耦合费米气体的超流配对能隙，并驱动BCS-BEC渡越，为调控超流配对提供新手段。
AI中文摘要：
我们研究了在自旋选择性单体耗散作用下的二维Rashba自旋轨道耦合费米气体中的超流配对。在非厄米平均场框架内，我们自洽地求解了能隙方程和粒子数方程，发现中等强度的耗散可以显著增强配对能隙，导致配对能隙对耗散强度呈现明显的非单调依赖关系。耗散还提供了额外的控制参数，用于驱动系统跨越BCS-BEC渡越。我们进一步分析了准粒子谱，并识别出两个不同的超流区域，其特征分别为一个和三个例外环，由例外谱跃迁分隔。有趣的是，耗散可以同时增强两个配对通道，同时在三重态分量中引入动量依赖的相位扭转。这些结果表明，自旋选择性耗散为操纵自旋轨道耦合量子气体中的超流配对、谱结构和渡越物理提供了多功能的非厄米控制旋钮。
英文摘要：
We investigate superfluid pairing in a two-dimensional Rashba spin-orbit-coupled Fermi gas subject to spin-selective one-body loss. Within the non-Hermitian mean-field framework, we self- consistently solve the gap and number equations and find that moderate dissipation can significantly enhance the pairing gap, resulting in a pronounced nonmonotonic dependence on the dissipation strength. Dissipation also provides an additional control parameter for driving the system across the BCS-BEC crossover. We further analyze the quasi-particle spectrum and identify two distinct superfluid regimes characterized by one and three exceptional rings, separated by an exceptional spectral transition. Interestingly, dissipation can enhance both pairing channels while simultaneously inducing a momentum-dependent phase twist in the triplet component. These results demonstrate that spin-selective dissipation provides a versatile non-Hermitian control knob for manipulating superfluid pairing, spectral structure, and crossover physics in spin-orbit-coupled quantum gases.
