Kavli Affiliate: Sander Otte
| First 5 Authors: Rasa Rejali, Laëtitia Farinacci, Sander Otte, ,
| Summary:
Differential conductance spectroscopy performed in the high bias regime — in
which the applied voltage exceeds the sample work function — is a poor measure
of the local density of states due to the effects of the changing tunnel
barrier. Additionally, the large applied voltage oftentimes makes
constant-height measurement experimentally impractical, lending
constant-current spectroscopy an advantageous edge; but the differential
conductance in that case is even further removed from the local density of
states due to the changing tip height. Here, we present a normalization scheme
for extracting the local density of states from high bias scanning tunneling
spectroscopy, obtained in either constant-current or constant-height mode. We
extend this model to account for the effects of the in-plane momentum of the
probed states to the overall current. We demonstrate the validity of the
proposed scheme by applying it to laterally confined field-emission resonances,
which appear as peak-shaped spectroscopic features with a well-defined in-plane
momentum.
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