Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Scanning Probe Techniques: STM

O 79.7: Vortrag

Donnerstag, 19. März 2015, 12:15–12:30, HE 101

Inelastic tunneling through a hydrogen molecule — •Matthias Stocker, Simon Röger, and Berndt Koslowski — Universität Ulm, Ulm, Deutschland

Recent studies showed strong characteristic features in Inelastic Electron Tunneling Spectroscopy if molecular hydrogen was physisorbed on a metallic substrate surface [1,2]. In the low energy regime not only huge inelastic signals were measured but also a step-like change of the tunneling current corresponding to a strong negative differential conductivity appeared. This characteristic behavior was explained by a two-level system exhibiting two distinct conductivities, and the occupation of the two levels being controlled by the applied bias. However, details of the two-level system are a matter of speculation, yet. On the basis of detailed spectroscopic measurements, we will propose a new formalism to analyze the behavior of such I-V characteristics. We will try to explain the observed features by dynamic properties of a hydrogen molecule in the tunneling junction.

[1] F. Natterer, F. Patthey, H. Brune, PRL 111, 175303 (2013). [2] S. Li, A. Yu, F. Toledo, Z. Han, H. Wang, H.Y. He,R. Wu, W. Ho, PRL 111, 146102 (2013).