Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Metallic Nanowires on Semiconductor Surfaces
O 96.6: Talk
Thursday, March 23, 2017, 16:15–16:30, WIL C107
Analysis of the electronic and atomic structure of Pb/Si(557) by polarization dependent two-photon photoemission — •Abdul Samad Syed1, Vesna Miksic-Trontl1, Manuel Ligges1, Ping Zhou1, Herbert Pfnür2, Christoph Tegenkamp2, and Uwe Bovensiepen1 — 1Universität Duisburg-Essen, Fakultät für Physik und Zentrum für Nanointegration (Cenide), 47048 Duisburg — 2Leibniz-Universität Hannover, Institut für Festkörperphysik, Appelstrasse 2, 30167 Hannover
The local structure of atomic wires Pb/Si(557) is determined (i) by the macroscopic quasi one dimensional symmetry imposed by the vicinal cut substrate and (ii) local arrangement of Pb atoms on the Si terraces. We analyze the electronic structure by angle-resolved two-photon photoemission (2PPE) as a function of light polarization and find a dichroism in the 2PPE intensity for opposite electron momenta along the terraces kx and −kx. Considering earlier work [1] on Pb/Si(111) which concluded on the coexistence of the H3 and T4 symmetry in the √3 × √3 reconstruction, the observed polarization dependent dichroism suggests a combination of three and six fold symmetry of the Pb arrangement on Si(557) in agreement with a compressed structure along the Si terrace.
Funding by the DFG through FOR 1700 is gratefully acknowledged.
[1] A. Baumann, E. Speiser, S. Chandola, J. Räthel, P. Kratzer, S. Sakong, C. Tegenkamp, N. Esser (2016).