AI 中文总结
本文研究菱面石墨烯谷不平衡四分之一金属相的一维畴壁，发现两类畴壁，其类型由谷间洪德耦合与自旋轨道耦合的竞争决定，且畴壁动力学可与超导输运耦合。
AI 中文摘要
磁序的空间纹理（如畴壁和斯格明子）是磁学中的基本研究对象。菱面多层石墨烯的磁序涉及自旋和谷自由度，为产生全新的空间纹理提供了可能。本文通过微观研究菱面石墨烯谷不平衡四分之一金属相中的一维畴壁，探索了这一可能性。我们发现两类不同的畴壁：一类类似传统磁畴壁，在两个体态之间发生局域旋转；另一类本质上是多分量的，探索了两个体畴中均未占据的状态。哪种纹理会实现，由谷间洪德耦合与自旋轨道耦合之间的竞争决定，我们确定了区分这两类畴壁的实验特征。我们进一步表明，在横跨畴壁形成的超导结中，超导相位差会直接与该纹理的谷间相干相位耦合，该内部相位的进动可在结两端产生电压。我们的理论表明，菱面石墨烯确实具有超出传统磁体的磁纹理，且其动力学可与超导输运耦合。
英文摘要
Spatial textures of magnetic order, such as domain walls and skyrmions, are fundamental objects in magnetism. In rhombohedral multilayer graphene, magnetic order involves spin and valley degrees of freedom, opening the possibility of qualitatively new spatial textures. Here, we explore this possibility through a microscopic study of a one-dimensional domain wall in the valley-imbalanced quarter-metal phase of rhombohedral graphene. We uncover two different classes of domain walls. One resembles a conventional magnetic domain wall, locally rotating between the two bulk states, whereas the other is intrinsically multicomponent and explores states that are not occupied in either bulk domain. Which texture is realized is controlled by the competition between intervalley Hund's coupling and spin-orbit coupling, and we identify experimental signatures to distinguish them. We further show that, in a superconducting junction formed across the wall, the superconducting phase difference couples directly to the intervalley-coherent phase of the texture. Precession of this internal phase can therefore generate a voltage across the junction. Our theory shows that rhombohedral graphene indeed has magnetic textures beyond conventional magnet and that their dynamics can couple to superconducting transport.
Comments4+16 pages. 9 Figures. Related experiments: arXiv:2608.25257, arXiv:2608.25263
