Direct observation of spin splitting in bismuth surface states
Direct observation of spin splitting in bismuth surface states
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DOI：
10.1103/physrevb.76.153305
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发表时间：
2007-10
影响因子：
3.7
通讯作者：
T. Hirahara;K. Miyamoto;I. Matsuda;T. Kadono;A. Kimura;T. Nagao;G. Bihlmayer;E. Chulkov;S. Qia
中科院分区：
文献类型：
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作者：
T. Hirahara;K. Miyamoto;I. Matsuda;T. Kadono;A. Kimura;T. Nagao;G. Bihlmayer;E. Chulkov;S. Qia
2007年4月6日收到；2007年5月21日收到修改稿；2007年10月12日发表
利用自旋和角分辨光电子能谱研究了Si(111)-7×7上超薄Bi(001)薄膜的电子结构。我们直接观察到表面态能带清晰的与动量相关的自旋劈裂和极化。如理论所预测，自旋结构相对于$\overline{\Gamma}$点是反对称的，并且所获得的面内自旋极化高达±0.5。通过与第一性原理计算得到的自旋极化能带结构进行比较，讨论了所观察到的自旋极化的定性特征。
DOI: 10.1103/PhysRevB.76.153305
PACS分类号：79.60.Bm，68.35.p，73.20.r，85.75.d
Received 6 April 2007; revised manuscript received 21 May 2007; published 12 October 2007The electronic structure of ultrathin Bi 001 filmsonSi 111 -7 7 was studied by spin and angle-resolvedphotoemission spectroscopy. We directly observed a clear momentum-dependent spin splitting and polarizationof the surface-state bands. The spin structure was antisymmetric with respect to the ¯ point as predicted bytheory, and the obtained in-plane spin polarization was as high as ±0.5. The qualitative features of the observedspin polarization are discussed in comparison with the spin-polarized band structure obtained by first-principlescalculations.DOI: 10.1103/PhysRevB.76.153305 PACS number s : 79.60.Bm, 68.35. p, 73.20. r, 85.75. d