Giant out-of-plane spin component and the asymmetry of spin polarization in surface Rashba states of bismuth thin film.
Giant out-of-plane spin component and the asymmetry of spin polarization in surface Rashba states of bismuth thin film.
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DOI：
10.1103/physrevlett.106.166401
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发表时间：
2011-04
影响因子：
8.6
通讯作者：
A. Takayama;T. Sato;S. Souma;T. Takahashi
中科院分区：
文献类型：
--
作者：
A. Takayama;T. Sato;S. Souma;T. Takahashi
利用高分辨自旋和角分辨光电子能谱研究了Si（111）衬底上铋薄膜表面态的自旋结构。与传统的Rashba分裂不同，面内自旋极化的大小在穿过区中心的两个细长表面空穴袋之间是不对称的。此外，我们发现了一个巨大的面外自旋极化，其大小与面内对应物一样大，它在Γ-M线上切换符号。我们从对称破缺和多体效应的角度讨论了这一发现。
We have performed high-resolution spin- and angle-resolved photoemission spectroscopy of bismuth thin film on Si(111) to investigate the spin structure of surface states. Unlike the conventional Rashba splitting, the magnitude of the in-plane spin polarization is asymmetric between the two elongated surface hole pockets across the zone center. Moreover, we uncovered a giant out-of-plane spin polarization as large as the in-plane counterpart which switches the sign across the Γ-M line. We discuss the present finding in terms of the symmetry breaking and the many-body effects.