Conduction States with Vanishing Dimerization in Pt Nanowires on Ge(001) Observed with Scanning Tunneling Microscopy

TL;DR

This study uses scanning tunneling microscopy to investigate the electronic properties of Pt nanowires on Ge(001), revealing vanishing dimerization near the Fermi level and identifying conduction states, with implications for their metallic behavior.

Contribution

It demonstrates that dimerization in Pt nanowires diminishes near the Fermi level, highlighting conduction states and challenging previous assumptions about their electronic structure.

Findings

Dimerization diminishes near the Fermi level at low tunneling currents.

Conduction states are associated with evenly spaced atoms.

Implications for the metallicity of Pt nanowires are discussed.

Abstract

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.