Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 95: Metallic nanowires on the atomic scale (DS with O)
O 95.13: Talk
Friday, March 20, 2015, 13:00–13:15, H 2032
Tb silicide nanowires on Si(001) - a one-dimensional metal? — •Stephan Appelfeller, Martin Franz, Christopher Prohl, Jan Große, Zeno Diemer, and Mario Dähne — Inst. f. Festkörperphysik, TU Berlin, Hardenbergstr. 36, 10623 Berlin
Rare earth metals are well known for their formation of metallic bulk silicides with low Schottky-barrier heigths to n-type Si. Using appropriate preparation conditions, some rare earth metals, e.g. Tb, are forming silicide nanowires on Si(001) by self-assembly, which have widths of only a few nanometers and lengths of several hundred nanometers. Here, the structural and electronical properties of Tb silicide nanowires are elucidated.
The structural information gained by scanning tunneling microscopy indicates that the Tb silicide nanowires consist of metallic hexagonal TbSi2. Scanning tunneling spectroscopy confirms this finding by showing metallic behavior. Furthermore, angle resolved photoemission data obtained at the UE56/2 PGM1 beamline of BESSY clearly reveal a one-dimensional metallic band structure without dispersion perpendicular to the nanowire main axis. Thus, Tb silicide nanowires are promising for future investigations of unique phenomena of one-dimensional metals, such as the Peierls transition.
This work was supported by the DFG, FOR 1700, project E2. We kindly acknowledge the support of K. Horn and coworkers and of BESSY.