中心对称BiOI中自旋动量层锁定的观察
Observation of spin-momentum-layer locking in centrosymmetric BiOI
摘要：
自旋极化效应通常被认为是自旋-轨道耦合的结果，前提是缺乏全局反转对称性，也称为“自旋-动量锁定”。最近发现的隐藏的自旋极化表明，特定的原子位置不对称性也可以引起可测量的自旋极化，导致范式转移到潜在的自旋电子学应用的中心对称晶体。在这里，结合自旋和角度分辨光电子能谱和理论计算，我们报告不同的自旋层锁定现象周围的中心对称，分层材料BiOI不同的高对称动量。由于布里渊区的非对称晶体结构，在布里渊区的边界附近，自旋极化率很高，而在中心附近，自旋几乎消失。我们的工作不仅证明了隐藏的自旋极化的存在，而且还揭示了自旋，动量和层锁定方式的微观机制，为未来的自旋电子器件的设计指标提供了依据。
英文摘要：
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.
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