Direct measurements of the L-gap surface states on the (111) face of noble metals by photoelectron spectroscopy -: art. no. 115415
Direct measurements of the L-gap surface states on the (111) face of noble metals by photoelectron spectroscopy -: art. no. 115415
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DOI：
10.1103/physrevb.63.115415
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发表时间：
2001-03-15
影响因子：
3.7
通讯作者：
Hüfner, S
中科院分区：
文献类型：
--
作者：
Reinert, F;Nicolay, G;Hüfner, S
利用高分辨角分辨光电子能谱（PES）对Cu、Ag和Au（111）面的L-能隙表面态进行了全面的光电子能谱研究。在角分辨率约为Δ θ = +/-0.15度，能量分辨率约为Δ E = 3.5meV的条件下，我们的数据建立了这些表面态的本征寿命展宽和色散关系的新值。我们比较我们的光电结果最近发表的理论计算和测量扫描隧道光谱（STS）。在Au（111）态的情况下，我们观察到与STS数据相比的特定定性差异：PES数据显示分裂色散和费米表面，这可能是由表面态电子的自旋-轨道相互作用引起的。
We present a comprehensive photoemission study of the L-gap surface states of the (111) surfaces of Cu, Ag, and Au by high-resolution angle-resolved photoelectron spectroscopy (PES). With an angular resolution of about Delta theta = +/-0.15 degrees and an energy resolution of DeltaE approximate to3.5 meV, our data establish new values for the intrinsic lifetime broadening and the dispersion relation of these surface states. We compare our photoemission results to recently published theoretical calculations and measurements by scanning tunneling spectroscopy (STS). In the case of the Au(111) state, we observe particular qualitative discrepancies in comparison to the STS data: the PES data show a split dispersion and Fermi surface, possibly caused by a spin-orbit interaction of the surface state electrons.