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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 10: New Methods and Developments II: Scanning Probe, Spectroscopic, and Diffraction Techniques

O 10.1: Vortrag

Montag, 1. April 2019, 15:00–15:15, H3

Interaction between a metallic STM tip and a single CO molecule adsorbed on a copper surface — •Norio Okabayashi1,2, Angelo Peronio2, Sonia Matencio2, Ferdinand Huber2, Thomas Frederiksen3, Magnus Paulsson4, and Franz J. Giessibl21Kanazawa University, Kanazawa, Japan — 2University of Regensburg, Regensburg, Germany — 3Donostia International Physics Center, San Sebastián, Spain — 4Linnaeus University, Kalmer, Sweden

In order to investigate the interaction between a CO molecule and the metallic tip of a scanning probe microscope, we have combined inelastic electron tunneling spectroscopy (IETS) and non-contact atomic force microscopy (AFM) with a qPlus sensor. We have found that the higher the tip-molecule interaction, the more the vibrational modes of the molecule are perturbed. These findings have been rationalized by a classical model describing the molecule as a double pendulum, where the presence of the tip weakens the tip-surface chemical bond [1]. However, in our previous research, the lower limit of a tip molecule distance for an IETS measurement was restricted owing to the method to measure a tunneling current with an interaction force. We have improved our method to understand what happens at smaller tip molecule distances, confirming the validity of our previous findings for both the Cu(111) and Cu(110) surfaces. In addition, bistable configurations are observed at very small tip-molecule distances for both surfaces. [1] N. Okabayashi, A. Peronio, M. Paulsson, T. Arai, and F. J. Giessibl, PNAS 115, 4571 (2018).

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