Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Electronic Structure of Surfaces I
O 4.7: Vortrag
Montag, 16. März 2015, 12:00–12:15, MA 041
First principles exploration of noble metal lanthanide surface alloys — •Matthieu Verstraete1, Bin Xu1, Lucia Vitali2, Laura Fernandez2, Frederik Michael Schiller2, Maider Ormaza2, and Enrique Ortega2 — 1University of Liège, Liège, Belgium — 2Universidad del Pais Vasco, San Sebastian, Spain
The electronic and magnetic structure of X2L alloys of noble metals (X = Ag Au Cu) with lanthanides (L = La Gd Ce...) is investigated by first principles calculations, to explain and complement a series of surface science techniques (ARPES, XRD, STM, STS, MOKE). The complex interplay of magnetic, strain, and chemical variables produces a variety of different electronic states for very similar geometric structures. STM profile inversions, relativistic and spin polarized band splittings, and a series of hole and electron like surface states all result from varying the noble metal or lanthanide. The common point in these systems is the existence of an experimental "sweet spot" in the synthesis, generating a homogeneous surface alloy showing a hexagonal motif and a long range moiré pattern. Density functional theory band and structure calculations shed light on the nature of the states and their magnetism.
Xu, B. et al. in preparation (2015)
Ormaza, M. et al. in preparation (2015)
Ormaza, M., et al. Phys. Rev. B 88, 125405 (2013)
Corso, M., et al. Phys Rev Lett 105, 016101 (2010)