Strong electron correlations have long been recognized as driving the emergence of novel phases of matter. A well recognized example is high-temperature superconductivity which cannot be understood in terms of the standard weak-coupling theory. The exotic properties that accompany the formation of the two-channel Kondo (2CK) effect, including the emergence of an unconventional metallic state in the low-energy limit, also originate from strong electron interactions. Despite its paradigmatic role for the formation of non-standard metal behavior, the stringent conditions required for its emergence have made the observation of the nonmagnetic, orbital 2CK effect in real quantum materials difficult, if not impossible. We report the observation of orbital one- and two-channel Kondo physics in the symmetry-enforced Dirac nodal line (DNL) metals IrO₂ and RuO₂ nanowires and show that the symmetries that enforce the existence of DNLs also promote the formation of nonmagnetic Kondo correlations. Rutile oxide nanostructures thus form a versatile quantum matter platform to engineer and explore intrinsic, interacting topological states of matter.

长期以来，人们一直认为强电子相关性推动了物质新相的出现。一个公认的例子是高温超导性，它不能用标准的弱耦合理论来理解。伴随双通道近藤 (2CK) 效应形成的奇异特性，包括在低能量极限下出现非常规金属态，也源于强电子相互作用。尽管它在形成非标准金属行为方面发挥了典型作用，但其出现所需的严格条件使得在真实量子材料中观察非磁性轨道 2CK 效应变得困难，如果不是不可能的话。我们报告了在对称强制狄拉克节点线 (DNL) 金属 IrO 中对轨道单通道和双通道 Kondo 物理的观察₂和 RuO ₂纳米线，并表明强制 DNL 存在的对称性也促进了非磁性 Kondo 相关性的形成。因此，金红石氧化物纳米结构形成了一个多功能的量子物质平台，以设计和探索物质的内在、相互作用的拓扑状态。