发表机构
Rutgers University; University of California, Berkeley; Rice University; National High Magnetic Field Laboratory; Tsinghua University（罗格斯大学; 加州大学伯克利分校; 莱斯大学; 国家高磁场实验室; 清华大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究构建外尔半金属与量子自旋冰候选材料的人工近藤晶格界面，发现量子自旋冰关联可印记在外尔费米弧输运上，为阻挫量子磁性的输运调控提供新途径。
AI 中文摘要
量子自旋冰具有集体激发和量子涨落，由于支撑它们的材料是绝缘的，这些激发和涨落大多是电沉默的。将这种磁性环境与表面局域的外尔态耦合，提供了一条将其关联直接编码到费米弧输运中的途径，然而，实验上对这一 regime 的探索仍十分有限。在此，我们在外尔半金属$\boldsymbol{\rm Eu_2Ir_2O_7}$与量子自旋冰候选材料$\boldsymbol{\rm Tb_2Ti_2O_7}$之间构建了人工近藤晶格界面，并证明量子自旋冰关联被印记在外尔费米弧输运上。在极低温下，电子输运从低场下的六重各向异性响应，演变为中场区间的十二重响应，之后在高场下进入重入型六重各向异性状态。在经典自旋冰界面未观察到类似的十二重响应。量子-经典对比表明，同一巡游电子通道在与量子涨落的铽矩相互作用时，获得了性质不同的对称性信息，这与外尔表面态和横向多极自由度、以及纵向偶极贡献之间的界面耦合一致。我们的工作确立了人工近藤晶格界面作为将具有多极关联的阻挫量子磁性转化为不同外尔费米弧输运响应的途径。
英文摘要
Quantum spin ice hosts collective excitations and quantum fluctuations that are largely electrically silent because the materials supporting them are insulating. Coupling this magnetic environment to surface-localized Weyl states offers a route to encode its correlations directly into Fermi-arc transport. Experimental access to this regime, however, has remained largely unexplored. Here, we realize a synthetic Kondo lattice interface between the Weyl semimetal $\mathrm{Eu_2Ir_2O_7}$ and the quantum-spin-ice candidate $\mathrm{Tb_2Ti_2O_7}$, and demonstrate that quantum-spin-ice correlations are imprinted on Weyl Fermi-arc transport. At ultra-low temperature, electronic transport evolves from a sixfold anisotropic response at low field into a twelvefold response over an intermediate field window, before entering a reentrant sixfold anisotropy at high field. No analogous twelvefold response occurs at the classical-spin-ice interface. The quantum--classical contrast shows that the same itinerant electronic channel acquires qualitatively different symmetry information when interacting with the quantum-fluctuating Tb moments, consistent with an interfacial coupling between the Weyl surface states and the transverse, multipolar degrees of freedom, in addition to the longitudinal, dipolar contribution. Our work establishes synthetic Kondo lattice interfaces as a route for transducing frustrated quantum magnetism with multipole correlations into distinct Weyl Fermi-arc transport responses.
