论文标题
观察中心对称BIOI中的自旋摩托杆层锁定
Observation of spin-momentum-layer locking in centrosymmetric BiOI
论文作者
论文摘要
普遍认为，非磁性材料中的自旋极化效应是自旋轨道耦合的结果，前提是缺乏全局反转对称性，也称为“自旋摩托锁定”。最近发现的隐藏自旋极化表明，特定的原子位点不对称也可能诱导可测量的自旋极化，从而导致向中心对称晶体的范式转移，以实现潜在的自旋晶体。在这里，我们将自旋和角度分辨的光发射光谱和理论计算结合在一起，我们报告了在中心粒值的，分层的材料Bioi中围绕不同高对称力量的不同自旋层锁定现象。测得的自旋沿着布里渊区的边界高度极化，而由于其非晶格晶体结构，几乎在区域中心周围消失了。我们的工作不仅展示了隐藏的自旋极化的存在，而且还发现了旋转，动量和层锁定方式的微观机制，从而在设计指标上放出了未来的旋转设备的灯光。
Spin polarization effects in nonmagnetic materials are generally believed as an outcome of spin-orbit coupling provided that the global inversion symmetry is lacking, also known as 'spin-momentum locking'. The recently discovered hidden spin polarization indicates that specific atomic site asymmetry could also induce measurable spin polarization, leading to a paradigm shift to centrosymmetric crystals for potential spintronic applications. Here, combining spin- and angle-resolved photoemission spectroscopy and theoretical calculations, we report distinct spin-layer locking phenomena surrounding different high-symmetry momenta in a centrosymmetric, layered material BiOI. The measured spin is highly polarized along the Brillouin zone boundary, while is almost vanishing around the zone center due to its nonsymmorphic crystal structure. Our work not only demonstrates the existence of hidden spin polarization, but also uncovers the microscopic mechanism of the way spin, momentum and layer locking to each other, shedding lights on the design metrics for future spintronic devices.
