Enhanced conductance response in radio frequency scanning tunnelling microscopy

Diverse spectroscopic methods operating at radio frequency depend on a reliable calibration to compensate for the frequency dependent damping of the transmission lines. Calibration may be impeded by the existence of a sensitive interdependence of two or more experimental parameters. Here, we show by...

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Bibliographic Details
Published in:Scientific reports 2022-04, Vol.12 (1), p.6183-6183, Article 6183
Main Authors: Wit, Bareld, Vranik, Radovan, Müllegger, Stefan
Format: Article
Language:English
Subjects:
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Calibration
Conductance
Frequency dependence
Humanities and Social Sciences
Microscopy
multidisciplinary
Scanning tunneling microscopy
Science
Science (multidisciplinary)
Transmission lines
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Summary:Diverse spectroscopic methods operating at radio frequency depend on a reliable calibration to compensate for the frequency dependent damping of the transmission lines. Calibration may be impeded by the existence of a sensitive interdependence of two or more experimental parameters. Here, we show by combined scanning tunnelling microscopy measurements and numerical simulations how a frequency-dependent conductance response is affected by different DC conductance behaviours of the tunnel junction. Distinct and well-defined DC-conductance behaviour is provided by our experimental model systems, which include C 60 molecules on Au(111), exhibiting electronic configurations distinct from the well-known dim and bright C 60 ’s reported so far. We investigate specific combinations of experimental parameters. Variations of the modulation amplitude as small as only a few percent may result in systematic conductance deviations as large as one order of magnitude. We provide practical guidelines for calibrating respective measurements, which are relevant to RF spectroscopic measurements.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-09820-7