Photoemission and density functional theory study of Ge(100): Clean surface and Yb-induced (2x4) reconstruction

Photoemission and density functional theory study of Ge(100) : Clean surface and Yb-induced (2x4) reconstruction

QC 20130813
Clean and metal-adsorbed (100) surfaces of group-IV semiconductors, such as Si and Ge, often exhibit electronically and structurally similar reconstructions. However, the fundamental bulk properties of group-IV materials can have an impact on particular features of such systems, which are related, e.g., to final-state relaxation in photoemission and thus determine their spectral line shape. Here we have studied Yb/Ge(100)(2 x 4) reconstruction as well as clean Ge(100) surface by high-resolution photoelectron spectroscopy and ab initio calculations. An atomic geometry of both surfaces is thoroughly investigated. A detailed analysis of Ge 3d core-level photoemission, atomic origins of surface-shifted components, and final-state screening effects is presented. In particular, it is demonstrated that the core-hole screening plays an essential role in Ge 3d measurements, and that its amount in the complete screening model correlates well with the core-level binding energy of respective Ge atoms in the initial state. The results are discussed in the proper context of related reconstructions on Si(100).

Punkkinen, Marko Patrick JohnKTH,Tillämpad materialfysik(Swepub:kth)u1vmlqqu (author)
Laukkanen, P. (author)
Perälä, R. E. (author)
Lang, J. J. K. (author)
Dahl, J. (author)
Adell, JohanLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-jae (author)
Kokko, K. (author)
KTHTillämpad materialfysik (creator_code:org_t)

By the author/editor: Kuzmin, M.; Punkkinen, Marko ...; Laukkanen, P.; Perälä, R. E.; Lang, J. J. K.; Dahl, J.; show more...; Adell, Johan; Kokko, K.; show less...

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