Enhancing and reducing the Rashba-splitting at surfaces by adsorbates: Na and Xe on Bi/Cu(111)

被引：22

作者：

Bentmann, Hendrik ^{[1
,2
]}

Reinert, Friedrich ^{[1
,2
]}

机构：

[1] Univ Wurzburg, D-97074 Wurzburg, Germany

[2] Karlsruhe Inst Technol, Gemeinschaftslab Nanoanalyt, D-76021 Karlsruhe, Germany

来源：

NEW JOURNAL OF PHYSICS | 2013年 / 15卷

关键词：

HIGH-RESOLUTION PHOTOEMISSION; SPIN-ORBIT INTERACTION; AU(111); STATE;

D O I：

10.1088/1367-2630/15/11/115011

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The surface alloy Bi/Cu(111) shows a paradigmatic free-electron-like surface state with a very large Rashba-type spin-orbit splitting. Using angle-resolved photoemission we investigate how adsorbates of different chemical nature influence the size of the spin splitting in this system. We find that the adsorption of small amounts of monovalent Na atoms leads to an enhancement of the spin splitting while an overlayer of the closed-shell rare gas Xe causes a reduction. The latter result is in contrast to the Au(111) surface for which an increased splitting size after Xe-adsorption was observed. We discuss these experimental findings in terms of the characteristic differences of the surface state wave functions and their spatial deformation in the presence of different types of adsorbates. Our results provide insight into the complex interplay of atomic and interface potential gradients governing the Rashba effect.

引用

页数：16

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