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Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 7: Symposium: Atomic Wires at Surfaces I
(Invited Speakers: Franz Himpsel, Hanno Weitering, Han Woong Yeom)

O 7.7: Vortrag

Montag, 25. Februar 2008, 13:30–13:45, HE 101

Peierls instability in platinum chains on Ge(001) — •Arie van Houselt, Daan Kockmann, Bene Poelsema, and Harold Zandvliet — University of Twente, Enschede, The Netherlands

We have studied the structural and electronic properties of atomic Pt chains on a germanium (001) substrate. Using scanning tunneling microscopy we show that these Pt chains undergo a phase transition from a 2x periodicity at room temperature to a 4x periodicity at low temperatures. The coupling between the atomic chains turns out to be of essential importance, since isolated Pt chains and chains located at the edge of an array of chains maintain their 2x periodicity at temperatures as low as 4.7 K. The 2x to 4x transition is accompanied by an opening of an energy gap and can be interpreted as a Peierls instability.

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