笼目超导体中的拓扑对密度波
Topological pair density waves in kagome superconductors
- Southern University of Science and Technology（南方科技大学）
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）
- Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
- University of Zurich（苏黎世大学）
- The University of Tokyo（东京大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文综述拓扑对密度波（TPDW）的研究进展，探讨其在笼目超导体中的实现可能性，分析相关挑战与实验特征，展望其在关联拓扑量子相领域的研究机遇。
AI中文摘要：
对密度波（PDW）是一种非常规超导态，因有限动量Q的配对而呈现周期性配对调制。在二维体系中，PDW的多个Q分量可具有非平庸相对相位，破坏时间反演对称性并形成拓扑电子结构。本文综述拓扑PDW（TPDW）的研究进展，探讨其在笼目超导体中的潜在实现。首先从Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）态引入TPDW概念，分析其实现面临的挑战；接着讨论笼目晶格中TPDW的可能性，其与手性超导态、环电流交织，关联到描述量子反常霍尔效应的模型；此外，综述AV₃Sb₅（A=Cs、Rb、K）超导体中TPDW的实验特征，重点关注可切换手性配对调制、Bogoliubov费米态、超导二极管效应及反常热霍尔效应等量子效应；最后展望该关联拓扑量子相的未来研究机遇，探讨其在有限动量配对、拓扑物质、手性超导领域的广泛意义。
英文摘要：
The pair density wave (PDW) is an unconventional superconducting state exhibiting periodic pairing modulations due to pairing with finite momentum Q. In two dimensions, multiple Q components of the PDW can have a non-trivial relative phase, breaking time-reversal symmetry and resulting in a topological electronic structure. Here we review progress on exploring such topological PDWs (TPDWs) and discuss their potential realization in kagome superconductors. We first introduce the concept of a TPDW starting from the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and examine the challenges toward its realization. We then discuss the possibility of a TPDW in the kagome lattice, which intertwines with chiral superconductivity and loop currents, thus connecting to models describing the quantum anomalous Hall effect. Furthermore, we review the experimental signatures of a TPDW in AV3Sb5 (A = Cs, Rb, K) superconductors and highlight related quantum effects, including switchable chiral pairing modulations, Bogoliubov Fermi states, the superconducting diode effect, and the anomalous thermal Hall effect. Finally, we project the future research opportunities of this correlated topological quantum phase and discuss its broad implications for finite-momentum pairing, topological matter, and chiral superconductivity.
