1992    
1993    
1994    
1995    
1996    
1997    
1998    
1999    
2000    
2001    
2002    
2003    
2004    
2005    
2006    
2007    
2008    
2009    
2010    
2011    
2012    
2013    
2014    
2015    
2016    
Fominykh, N., Berakdar, J.

Bulk- and surface-state two-electron photoemission from Cu(111)
Journal of Electron Spectroscopy and Related Phenomena 161, (1-3),pp 125-127 (2007)
We study theoretically the one-photon two-electron emission from the Cu(1 1 1) surface. Tuning the energy to either the surface state or to the d-band energy regions this sample provides a paradigm example of the two-particle emission from a (quasi) two-dimensional and a three-dimensional system, respectively. The independent electron-gas behavior of the surface-state electrons results in a characteristic angular pattern. We inspect the dependence of this angular shape on the strength of the electron-electron interaction. Furthermore, it is shown that the two-particle energy correlation behaves differently for bulk and surface states.