发表机构
Ludwig-Maximilians-Universität München; Technical University of Munich; Munich Center for Quantum Science and Technology（慕尼黑大学; 慕尼黑工业大学; 慕尼黑量子科学与技术中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过三维费什巴赫机制，在强耦合下揭示了三维哈伯德模型中的超导配对，预言了时间反演对称破缺的$d_{x^2-y^2}+id_{z^2}$配对态及无间隙韦尔点，为量子模拟提供了可检验的新里程碑。
AI 中文摘要
受三维费米-哈伯德模型中反铁磁相变首次实验实现的启发，我们对该模型的三维超导相进行了理论研究。通过构建费什巴赫机制的三维扩展，我们在强耦合下提供了一个统一的微观图像，其中配对由掺杂剂的近共振束缚态驱动。这些长寿命束缚态在三维中获得了与二维对应物截然不同的内部结构，从而产生了一种独特的超导态，即时间反演对称性破缺的$d_{x^2-y^2}+id_{z^2}$配对态。我们还提供了相应临界温度的估计，并证明由此产生的超导相拥有无间隙的韦尔点。我们的结果代表了量子模拟领域的一个新里程碑，挑战实验和大规模数值计算来检验我们的预测。
英文摘要
Motivated by the first experimental realization of the antiferromagnetic phase transition in the three-dimensional Fermi-Hubbard model, we present a theoretical study of the model's 3D superconducting phase. By formulating a 3D extension of the Feshbach mechanism, we provide a unified microscopic picture at strong coupling in which pairing is driven by near-resonant bound states of dopants. These long-lived bound states acquire a qualitatively different internal structure in three dimensions compared to their two-dimensional counterparts, giving rise to a distinct superconducting state, namely a time-reversal symmetry breaking $d_{x^2-y^2}+id_{z^2}$ pairing state. We also provide an estimate of the corresponding critical temperature, and provide evidence that the resulting superconducting phase hosts gapless Weyl points. Our results represent a new milestone for the field of quantum simulation, challenging experiments and large-scale numerics alike to test our predictions.
