Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.54: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Scanning tunneling microscopy of reconstructions including nanoline structures on the SrTiO3(001) surface — •Ines Weidle, Jochen Settelein, Julian Aulbach, Jörg Schäfer, Michael Sing, Lenart Dudy, and Ralph Claessen — Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
The surface of cleaved SrTiO3 hosts a two-dimensional electron gas which has recently attracted much attention as a model system for low-dimensional metals. On the other hand the surface of this oxide is known to exhibit a multitude of reconstructions. Among these reconstructions produced by a sequence of sputtering and annealing cycles, there are self-assembled nanoline-like structures of reduced titanate. These nanowires may have potential interest for (quasi-) one-dimensional physics of the electronic structure. We have explored the fabrication of these reconstructions on Nb-doped SrTiO3 and present our scanning tunneling microscopy (STM) measurements on nanoline structures.
A systematic study of the evolution of the various reconstructions has been performed as a function of the annealing treatment. After annealing, the STM images show widespread formation of a c(4 × 2) reconstruction. Subsequent annealing treatment promotes the occurrence of so-called dilines in (6 × 2) reconstruction. Their density can be increased upon further temperature treatment. The presentation discusses the various surface phases observed and provides a comparison with the pertinent literature.