Unconventional broadening of Rashba spin splitting in a Au2Sb surface alloy with periodic structural defects

IF 5.4 1区 物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY npj Quantum Materials Pub Date : 2025-01-11 DOI:10.1038/s41535-024-00724-5
Jinbang Hu, Xiansi Wang, Anna Cecilie Åsland, Justin W. Wells
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Abstract

Most Rashba spin splitting experimentally studied so far has ideal lattice with inversion symmetry broken, which limits the possibility to minimize the presence of spin-degenerate carriers near the Fermi level. Here, we report a novel 2D Au2Sb surface alloy decorated with periodic structural defects that exhibits modulation on the Rashba spin-orbit coupling band. Spin- and angle-resolved photoemission spectroscopy reveals a Rashba spin-split band with antiparallel spin polarization, significantly broadened compared to the Au₂Sn surface alloy. From the good agreement between the experimental results and DFT calculations, we identify that the broadening of the Rashba bands comes from variations in Sb atom corrugation induced by the periodic three-pointed star-shaped defects. These periodic defects can shift the energy position of the Rashba bands without breaking the in-plane rotational and mirror symmetries. Our findings highlight the potential to tune spin-dependent properties in 2D materials for spintronic applications.

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具有周期性结构缺陷的Au2Sb表面合金Rashba自旋劈裂的非常规展宽
到目前为止,实验研究的大多数Rashba自旋分裂都具有理想的晶格,其反演对称性被破坏,这限制了在费米能级附近最小化自旋简并载流子存在的可能性。本文报道了一种具有周期性结构缺陷的新型二维Au2Sb表面合金,该合金在Rashba自旋轨道耦合带上表现出调制特性。自旋和角度分辨光发射光谱显示,与Au₂Sn表面合金相比,具有反平行自旋极化的Rashba自旋分裂带明显拓宽。实验结果与DFT计算结果吻合较好,表明Rashba能带的展宽是由周期性三叉星形缺陷引起的Sb原子波纹的变化引起的。这些周期性缺陷可以改变Rashba能带的能量位置,而不会破坏面内旋转对称性和镜像对称性。我们的发现强调了在自旋电子应用中调整二维材料中自旋相关特性的潜力。
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来源期刊
npj Quantum Materials
npj Quantum Materials Materials Science-Electronic, Optical and Magnetic Materials
CiteScore
10.60
自引率
3.50%
发文量
107
审稿时长
6 weeks
期刊介绍: npj Quantum Materials is an open access journal that publishes works that significantly advance the understanding of quantum materials, including their fundamental properties, fabrication and applications.
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