Bareld Wit, Radovan Vranik, Stefan Müllegger,
"Enhanced conductance response in radio frequency scanning tunnelling microscopy"
, in Sci Rep, Vol. 12, Nummer 6183, 2022
Original Titel:
Enhanced conductance response in radio frequency scanning tunnelling microscopy
Sprache des Titels:
Englisch
Original Kurzfassung:
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.
Forschungs-