Platin-Nanodrähte auf Germanium mit STM
Dem Lehrstuhl für Experimentelle Physik IV ist erstmalig die Charakterisierung von Platin-Nanodrähten auf Germanium mit STM bis hin zu allerniedrigsten Tunnelspannnungen gelungen.
Conduction states with vanishing dimerization in Pt nanowires on Ge(001) observed with scanning tunneling microscopy
J. Schäfer,1 D. Schrupp,2 M. Preisinger,2 and R. Claessen1
1Physikalisches Institut, Universität Würzburg, 97074 Würzburg, Germany
2Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
PHYSICAL REVIEW B 74, 041404 (2006), Rapid Communications
The low-energy electronic properties of one-dimensional nanowires formed by Pt atoms on Ge(001) are studied with scanning tunneling microscopy down to the millivolt regime. The chain structure exhibits various dimerized elements at high tunneling bias, indicative of a substrate bonding origin rather than a charge density wave. Unexpectedly, this dimerization becomes vanishingly small when imaging energy windows close to the Fermi level with adequately low tunneling currents. Evenly spaced nanowire atoms emerge which are found to represent conduction states. Implications for the metallicity of the chains are discussed.
