Author/Authors :
Harold J.W. and van Houselt، نويسنده , , Arie and Gnielka، نويسنده , , Thomas and Aan de Brugh، نويسنده , , Joost M.J. and Oncel، نويسنده , , Nuri and Kockmann، نويسنده , , Daan and Heid، نويسنده , , Rolf and Bohnen، نويسنده , , Klaus-Peter and Poelsema، نويسنده , , Bene and Zandvliet، نويسنده , , Harold J.W.، نويسنده ,
Abstract :
We have studied the structural and electronic properties of atomic Pt chains on a Pt modified Ge(0 0 1) substrate. Using scanning tunneling microscopy we show that these Pt chains undergo a phase transition from a 2× periodicity at room temperature to a 4× periodicity at low temperature. 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 2× periodicity at temperatures as low as 4.7 K. The 2× to 4× transition is accompanied by an opening of an energy gap and is interpreted in terms of a Peierls instability.
Keywords :
Surface electronic phenomena , STM , Low dimensional physics , Semiconductor surface
