Momentum-resolved dynamics of Ar/Cu(1 0 0) interface states probed by time-resolved two-photon photoemission
Momentum-resolved dynamics of Ar/Cu(1 0 0) interface states probed by time-resolved two-photon photoemission
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时间分辨双光子光电发射探测 Ar/Cu(1 0 0) 界面态的动量分辨动力学
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
U. Höfer
中科院分区：
文献类型：
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作者：
M. Rohleder;K. Duncker;W. Berthold;J. Güdde;U. Höfer
通过时间分辨双光子光电子发射 (2PPE) 研究了埋藏 Ar/Cu(1 0 0) 图像势态的电子动力学作为平行动量的函数。第一界面态显示抛物线色散，有效质量为 0.6。它在 - 点的寿命为 110 fs，随着平行动量的增加而减少。衰变的动量依赖性可以通过 Cu 电子介导的带内和带间衰变过程来理解，就像干净的 Cu(1 0 0) 表面上图像势态的衰变一样。
The electron dynamics of buried Ar/Cu(1 0 0) image-potential states was investigated by time-resolved two-photon photoemission (2PPE) as a function of parallel momentum. The first interface state shows a parabolic dispersion with an effective mass of 0.6. Its lifetime of 110 fs at the -point decreases with increasing parallel momentum. The momentum dependence of the decay can be understood by intra- and inter-band decay processes mediated by Cu electrons, just as the decay of image-potential states on the clean Cu(1 0 0) surface.