标题： 相关性调制的外尔铁磁体费米弧拓扑结构 显示英文标题

标题： Correlation tuned Fermi-arc topology in a Weyl ferromagnet

摘要： 电子在费米弧（FAs）上，这是外尔半金属的特征，表现出具有手性异常、负磁阻和马约拉纳零模的手性输运。 虽然FAs在外尔半金属TaAs和Co3Sn2S2中被观察到，但对FAs的调控很少被研究。 在这里，我们以Co3Sn2S2为例，证明调节电子关联强度是控制FAs拓扑和连通性的有效方法。 在通过结合密度泛函理论和动态平均场理论（DFT+DMFT）计算获得与实验测量能带结构的良好一致后，我们表明实验中的电荷动力学由DFT+DMFT计算很好地再现，而并非由DFT计算。 电子关联重整了费米能级附近的能带，并修改了外尔点的能量和位置以及由此产生的FAs。 特别是，在钴终止的表面上，FAs是由相邻布里渊区中的外尔点连接形成的，在DFT+DMFT计算和实验中，这与DFT计算中同一布里渊区内的外尔点连接形成的FAs形成强烈对比。 我们进一步展示了FAs随关联的变化，并揭示了在更强关联强度下，锡终止表面上FAS的拓扑变化。 我们的研究为实验操控FAS以改善关联外尔半金属的电子性能提供了新的见解。 显示英文摘要

摘要： Electrons on Fermi arcs (FAs), a hallmark of Weyl semimetals, exhibit chiral transport harboring chiral anomaly, negative magnetoresistance, and Majorana zero modes. While FAs were observed in exemplary Weyl semimetal TaAs and Co3Sn2S2, the manipulation of FAs has been rarely explored. Here we take Co3Sn2S2 as an example and demonstrate that tuning the electronic correlation strength is an effective way to control the topology and connectivity of FAs. After achieving a good agreement with experimentally measured band structure by employing combined density functional theory and dynamical mean field theory (DFT+DMFT) calculations, we show that the experimental charge dynamics are well reproduced by DFT+DMFT calculations but not DFT calculations. Electronic correlation renormalizes the bands around the Fermi level and modifies the energy and location of Weyl points, and the resulting FAs. In particular, on the Co-terminated surface, the FAs are formed by connecting Weyl points located in adjacent Brillouin zones in DFT+DMFT calculations and experiments, in strong contrast to the FAs connecting Weyl points within the same Brillouin zone in DFT calculations. We further show the evolution of FAs with correlation and reveal a topological change of the FAs on the Sn-terminated surface at stronger correlation strength. Our study sheds new light on experimental manipulation of FAs to improve the electronic properties of correlated Weyl semimetals.