Electronic band structure of the two-dimensional metallic electron system Au/Ge(111)
Electronic band structure of the two-dimensional metallic electron system Au/Ge(111)
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DOI：
10.1103/physrevb.83.235435
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发表时间：
2011-06-30
影响因子：
3.7
通讯作者：
Claessen, R.
中科院分区：
文献类型：
--
作者：
Hoepfner, P.;Schaefer, J.;Claessen, R.
用角分辨光电子能谱和密度泛函理论计算方法详细研究了二维电子系统Au/Ge（111）-（root 3 x root 3）R30度.在结合这些结果，我们确定了四个金属带，无论是占主导地位的Au或Ge字符，分别。最大的费米面片，起源于Au轨道，是暗示的嵌套条件，由于它的六边形形状。然而，在室温至10 K之间没有观察到电荷密度波跃迁.用密度泛函理论计算得到的电子结构与实验符合得很好。这些计算还表明，有显着的自旋轨道分裂，特别是在Au相关的带，这是部分的Rashba字符。
The two-dimensional electron system Au/Ge(111)-(root 3 x root 3)R30 degrees is studied in detail by angle-resolved photoemission and density functional theory calculations. In combining these results, we identify four metallic bands which are either of dominantly Au or Ge character, respectively. The largest Fermi surface sheet, originating from Au orbitals, is suggestive of a nesting condition due to its hexagonal shape. However, a charge density wave transition is not observed between room temperature and 10 K. The electronic structure obtained by density functional theory with inclusion of a self-energy correction is in good agreement with the experiment. These calculations also indicate that there is significant spin-orbit splitting, especially in the Au-related bands, which is partly of Rashba character.