Non-Hermitian topological Fermi superfluid near the p-wave unitary limit
Non-Hermitian topological Fermi superfluid near the p-wave unitary limit
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p 波酉极限附近的非厄米拓扑费米超流体
DOI：
10.1103/physreva.107.033331
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发表时间：
2023
影响因子：
2.9
通讯作者：
and Tomoya Hayata
中科院分区：
文献类型：
--
作者：
Hiroyuki Tajima;Yuta Sekino;Daisuke Inotani;Akira Dohi;Shigehiro Nagataki;and Tomoya Hayata
本文从理论上讨论了一维双组分费米气体在波Feshbach共振附近的非厄米超流相变，并伴有偶极弛豫引起的两体损耗。我们指出，这个系统给了我们一个机会，探索各种非平凡的属性之间的相互作用，如在发散波散射长度的通用热力学，拓扑相变消失的化学势，和非厄米的Bardeen-Cooper-Schrieffer（BCS）玻色-爱因斯坦凝聚（BEC）过渡，在一个统一的方式。在BCS相，当有效非厄米哈密顿量中出现例外点时，会发生损耗诱导的超流-正常相变。在BEC相，扩散的无间隙模式可以被视为超流态不稳定性的前兆。此外，我们表明，超流态是脆弱的两体损失附近的拓扑相变点。
We discuss theoretically the non-Hermitian superfluid phase transition in one-dimensional two-component Fermi gases near the-wave Feshbach resonance accompanied by the two-body loss associated with dipolar relaxation. We point out that this system gives us an opportunity to explore the interplay among various nontrivial properties such as universal thermodynamics at divergent-wave scattering lengths, the topological phase transition at vanishing chemical potential, and the non-Hermitian Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) transition, in a unified manner. In the BCS phase, the loss-induced superfluid-normal transition occurs when the exceptional point appears in the effective non-Hermitian Hamiltonian. In the BEC phase, the diffusive gapless mode can be regarded as a precursor of the instability of the superfluid state. Moreover, we show that the superfluid state is fragile against the two-body loss near the topological phase transition point.