Experimental studies of an In/Pb binary surface alloy on Ge(111)
2016 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 649, 146-151 p.Article in journal (Refereed) Published
In this study, we present a binary In/Pb surface alloy on Ge(111) formed by evaporating0.85 monolayer (ML) of In on the Pb/Ge(111) surface with 1.33 ML of Pb. A welldefined3×3 periodicity is formed after annealing at a temperature of ≈200 °C, as verified by bothlow energy electron diffraction (LEED) and scanning tunneling microscopy (STM). OverviewSTM images, obtained at 50 K, show a clear 3×3 periodicity. Detailed STM images reveal thatthe protrusions consist of atomic sized features with a local hexagonal arrangement. Each 3×3unit cell contains nine such features indicating a structure with 9 atoms per 3×3 cell. Based onangle resolved photoelectron spectroscopy (ARPES) data, we have identified five surface bandswithin the bulk band gap. Four of them cross the Fermi level leading to a metallic character of thesurface. The dispersions of these bands have been mapped in detail along the high symmetrydirections of the 3×3 surface Brillouin zone. Fermi contours, mapped in 2D k-space, showinteresting features. In particular, the occurrence of two differently rotated hexagon like contoursis discussed.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 649, 146-151 p.
IdentifiersURN: urn:nbn:se:liu:diva-105222DOI: 10.1016/j.susc.2016.02.016ISI: 000379097000021OAI: oai:DiVA.org:liu-105222DiVA: diva2:704907
Funding agencies:Technical support from Dr. Johan Adell and Dr. T. Balasubramanian at MAX-lab is gratefully acknowledged. Financial support of the research work was provided by the Swedish Research Council (VR) and the Knut and Alice Wallenberg Foundation (KAW).
Vid tiden för disputation förelåg publikationen som manuskript2014-03-132014-03-132016-08-19Bibliographically approved