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O: Fachverband Oberflächenphysik
O 42: Nanostructures at surfaces I
O 42.8: Vortrag
Mittwoch, 28. März 2012, 12:15–12:30, MA 042
Reconstruction of Atomic-Scale Wires on Si(553)-Au: Observation of Current-Dependent Periodicity — •S. Polei1, I. Barke1, P.C. Snijders2, F.J. Himpsel3, S.C. Erwin4, and K.-H. Meiwes-Broer1 — 1Inst. für Physik, Uni Rostock, Rostock, Germany — 2Materials Science & Technology Division, Oak Ridge Nat. Lab., Oak Ridge, Tennessee, USA — 3Physics Dept., University of Wisconsin Madison, Madison, Wisconsin, USA — 4Center for Computational Materials Science, Naval Research Lab., Washington, DC, USA
Quasi one-dimensional metallic chains on silicon have received considerable attention in the last few years, primarily because they possess unusual electronic properties [1]. In particular, the Au-induced reconstruction of the Si(553) surface is of great interest because recent theoretical findings predict that it has a magnetic ground state [4]. We present STM and STS measurements to investigate the nature of the phase transition to a reconstructed Si step edge at low temperature and the possible development of non-zero Si spin-polarization. Different periodicities are observed at the Si step-edge chains depending on the tunneling current. When the tunneling current is increased at 51 K the reconstruction along the chains changes gradually from 1x3 to 1x2. As a result, the STM topography has 1x6 periodicity in the transition regime. Findings are discussed in the context of a possible magnetic state [2].
[1] J. N. Crain et al., PRB 69, 125401 (2004); P. C. Snijders et al., PRL 96, 076801 (2006); I. Barke et al., PRL 97, 226405 (2006) [2] S. C. Erwin, F. J. Himpsel, Nat. Commun. 1, 58 (2010)