Surface Fermi contours and phonon anomalies on Pt(111).
Surface Fermi contours and phonon anomalies on Pt(111).
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Pt(111) 上的表面费米轮廓和声子异常。
DOI：
10.1103/physrevb.43.12062
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
S. D. Kevan
中科院分区：
文献类型：
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作者：
Wei Di;Kevin E. Smith;S. D. Kevan
Pt(111) 的表面费米轮廓已通过高分辨率角分辨光电发射确定。存在两种产生不同费米轮廓的表面共振。第一个轮廓是一个以表面布里渊区为中心的近似六边形的电子袋，并且与第六体能带的投影边缘非常接近简并。另一个轮廓是以 K\ifmmode\bar\else\textasciimacron\fi{} 为中心的更扩散的三角形电子袋，并且与第五体能带中的投影间隙松散关联。这些结果并不支持这样的观点：在 Pt(111) 表面声子色散关系的测量中观察到的异常可能是由与表面局域态相关的筛选奇点引起的。我们的轮廓为未来寻找此类异常的声子测量提供了指导。
The surface Fermi contours of Pt(111) have been determined with use of high-resolution angle-resolved photoemission. There exist two surface resonances which produce distinct Fermi contours. The first contour is an approximately hexagonal electron pocket centered in the surface Brillouin zone and is very nearly degenerate with the edge of the projection of the sixth bulk band. The other contour is a more diffuse triangular electron pocket centered at K\ifmmode\bar\else\textasciimacron\fi{}, and is loosely associated with a projected gap in the fifth bulk band. These results do not support the suggestion that anomalies observed in measurements of the Pt(111) surface-phonon dispersion relations might be caused by screening singularities associated with surface-localized states. Our contours provide a guide for future phonon measurements seaching for such anomalies.