Giant Out-of-Plane Spin Component and the Asymmetry of Spin Polarization in Surface Rashba States of Bismuth Thin Film

被引：86
|
作者：
Takayama, A. [1 ]
Sato, T. [1 ]
Souma, S. [2 ]
Takahashi, T. [1 ,2 ]
机构：
[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan
[2] Tohoku Univ, WPI Res Ctr, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 16期
关键词：
RESOLVED PHOTOEMISSION; AU(111); BAND;
D O I：
10.1103/PhysRevLett.106.166401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 (Gamma) over bar-(M) over bar line. We discuss the present finding in terms of the symmetry breaking and the many-body effects.
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页数：4
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