Hybridization between the unoccupied Shockley surface state and bulk electronic states on Cu(111)
Hybridization between the unoccupied Shockley surface state and bulk electronic states on Cu(111)
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Cu(111) 上未占据的肖克利表面态和体电子态之间的杂化
DOI：
10.1103/physrevb.84.073107
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发表时间：
2011
影响因子：
3.7
通讯作者：
J. Kirschner
中科院分区：
文献类型：
--
作者：
A. A. Ünal;C. Tusche;S. Ouazi;S. Wedekind;C. Chiang;A. Winkelmann;D. Sander;J. Henk;J. Kirschner
利用多光子光电子能谱、扫描隧道谱和第一性原理电子结构计算方法，研究了Cu（111）表面占据态和未占据态的色散关系。随着费米能级以上能量的增加，色散明显偏离准自由电子的抛物线行为。基于我们的计算，我们归因于这种偏差的光谱重量的表面状态到散装的移位，反之亦然，这导致了增强的杂化状态之间的能量增加。PACS编号：73.20，At，79.60。i，79.60.Bm，71.20. B
Multi-photon photoemission, scanning tunneling spectroscopy and first-principles electronic structure calculations have been applied to determine the dispersion of the occupied and unoccupied Shockley surface state of Cu(111). The dispersion deviates significantly from the paradigmatic parabolic behavior of quasi-free electrons with increasing energy above the Fermi level. Based on our calculations, we ascribe this deviation to the shift of the spectral weight of the surface state into the bulk, and vice versa, which leads to an enhanced hybridization between the states with increasing energy. PACS numbers: 73.20.At, 79.60.-i, 79.60.Bm, 71.20.-b