Rashba splitting of graphene-covered Au(111) revealed by quasiparticle interference mapping
Rashba splitting of graphene-covered Au(111) revealed by quasiparticle interference mapping
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准粒子干涉图揭示石墨烯覆盖的 Au(111) 的 Rashba 分裂
DOI：
10.1103/physrevb.90.241406
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发表时间：
2014
影响因子：
3.7
通讯作者：
M. Fonin
中科院分区：
文献类型：
--
作者：
P. Leicht;J. Tesch;S. Bouvron;F. Blumenschein;P. Erler;L. Gragnaniello;M. Fonin
我们报告了在Au（111）上外延石墨烯片的低温扫描隧道光谱测量。我们表明，使用准粒子干涉（QPI）映射，我们可以区分石墨烯和Au（111）的电子系统。除了可以归因于每个系统内的弹性散射的散射矢量之外，我们观察到与石墨烯状态和Au（111）表面状态之间的散射过程相关的QPI特征。石墨烯/Au（111）界面处的这种额外的带间散射过程允许直接定量确定Au（111）表面状态的Rashba分裂，这不能从纯Au（111）上的QPI测量来评估。该实验展示了一种独特的局部光谱方法来研究弱相互作用的外延石墨烯/衬底界面处的Rashba分裂带。
We report on low-temperature scanning tunneling spectroscopy measurements on epitaxial graphene flakes on Au(111). We show that using quasiparticle interference (QPI) mapping, we can discriminate between the electronic systems of graphene and Au(111). Beyond the scattering vectors, which can be ascribed to the elastic scattering within each of the systems, we observe QPI features related to the scattering process between graphene states and the Au(111) surface state. This additional interband scattering process at the graphene/Au(111) interface allows the direct quantitative determination of the Rashba-splitting of the Au(111) surface state, which cannot be evaluated from QPI measurements on pure Au(111). This experiment demonstrates a unique local spectroscopic approach to investigate the Rashba-split bands at weakly interacting epitaxial graphene/substrate interfaces.