Microscopy from Scientific Research

d I /d V maps at the Fermi energy ( V = 0 mV) around a monolayer step edge parallel to the b axis measured at T = 120 and 5 K. The corresponding topography is shown at the bottom. The colour-coded dots overlaid on the topographic image correspond to the specific spatial locations where the d I /d V spectra in f were acquired. Tunnelling junction set-up: V set = 300 mV, I set = 0.5 nA and the modulation voltage used for the lock-in detection V mod = 2 mV. H and L in the colour bars denote high and low intensities, respectively.

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