Competing interactions in quantum materials induce exotic states of matter such as frustrated magnets, an extensive field of research from both the theoretical and experimental perspectives. Here, we show that competing energy scales present in the low-dimensional orbital-selective Mott phase (OSMP) induce an exotic magnetic order, never reported before. Earlier neutron-scattering experiments on iron-based 123 ladder materials, where OSMP is relevant, already confirmed our previous theoretical prediction of block magnetism (magnetic order of the form ↑↑↓↓). Now we argue that another phase can be stabilized in multiorbital Hubbard models, the block–spiral state. In this state, the magnetic islands form a spiral propagating through the chain but with the blocks maintaining their identity, namely rigidly rotating. The block–spiral state is stabilized without any apparent frustration, the common avenue to generate spiral arrangements in multiferroics. By examining the behavior of the electronic degrees of freedom, parity-breaking quasiparticles are revealed. Finally, a simple phenomenological model that accurately captures the macroscopic spin spiral arrangement is also introduced, and fingerprints for the neutron-scattering experimental detection are provided.

量子材料中的竞争相互作用会诱发奇异的物质状态，例如受挫磁体，从理论和实验的角度来看，这是一个广泛的研究领域。在这里，我们证明低维轨道选择性莫特相（OSMP）中存在的竞争能级会产生一种以前从未报道过的奇异磁序。早期对铁基 123 梯形材料进行的中子散射实验（其中 OSMP 相关）已经证实了我们之前对块磁性的理论预测（形式为磁序）↑↑↓↓）。现在我们认为，在多轨道哈伯德模型中可以稳定另一个相，即块螺旋态。在这种状态下，磁岛形成通过链传播的螺旋，但块保持其特性，即刚性旋转。块螺旋状态稳定，没有任何明显的挫败，这是多铁性中产生螺旋排列的常见途径。通过检查电子自由度的行为，揭示了宇称破缺的准粒子。最后，还介绍了一个准确捕捉宏观自旋螺旋排列的简单唯象模型，并提供了中子散射实验检测的指纹。