Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.78: Poster

Thursday, March 19, 2015, 09:30–12:00, Poster A

Manipulation of atomic chains on Ge(001) surface — •Deniz Aşan Acar, Umut Kamber, Dilek Yildiz, and Oğuzhan Gürlü — Istanbul Technical University, Istanbul, Turkey

Single atom thick self organized nanowires (NW) form on Ge(001) surface due to Au or Pt atoms adsorbed on to clean surfaces. Upon annealing of Pt deposited Ge(001) surface at 1000 K such atomic chains form along with two different types of terraces, namely the alpha and beta terraces [1]. Although the alpha terraces resemble the Ge(001) surface, beta terraces are due to a surface confined phase of platinum-germanide. Pt induced NWs form only on the beta terraces. Interestingly the wires only exist between surface defects resembling ropes fixed between two walls. Yet it is possible to generated artificial defects with the scanning tunneling microscope (STM) tip and the wires can be cut in to smaller sizes. Moreover the individual pieces of the wires can be picked up and put back on to the surfaces at room temperature by STM [2]. When the pieces of the nanowires were removed, the atomic structure of the underlying lattice of the wires was observed to differ from the beta terraces. Here we report the existence of a new domain on the Pt/Ge(001) system and we name these zones as the gamma zones. [1] O. Gurlu et al., APL 83, 22 (2003). [2] O. Gurlu et al., Nanotechnology 18, (2007) 365305 (4pp)