Terahertz scanning tunneling microscopy (THz-STM) is an emerging technique that provides simultaneous ultrafast temporal and Angstrom spatial resolution through lightwave control of an atomic tunnel junction. THz-STM can further accesses extreme tunneling regimes thanks to the low duty cycle and ultrafast duration of the THz bias. Here, we use low-temperature, ultrahigh vacuum THz-STM to explore the local density of electronic states in 7-atom-wide armchair graphene nanoribbons (7AGNRs) at tip heights that are inaccessible to conventional STM. Using a new procedure for THz scanning tunneling spectroscopy (THz-STS), we determine the differential conductance above the 7AGNR with atomic resolution in three dimensions.
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