Fig. 4: Results of the simulations.
a A simulated frequency shift x-z image of the singularity line (once positively charged molecule). The vertical cut is 2 × 0.8 nm2. b The simulated dissipation x-z image of the singularity line (once positively charged molecule). The vertical cut is 2 × 0.8 nm2 with a gap of 0.1 nm between the base image and perpendicular image of the singularity line. c Calculated Δf(z) spectroscopies for three different cuts through the singularity feature corresponding to three experimental Δf(z) curves, see Fig. 2i. The solid line is calculated for T = 5 K and dashed lines correspond to T = 1.2 K. The curves were calculated along the paths highlighted in a and b. d Calculated Ediss(z) spectroscopies for three different cuts through the singularity line, along the same paths as in c, corresponding to three experimental Ediss(z) curves, see Fig. 2j. The solid line is calculated for T = 5 K and the dashed lines correspond to T = 1.2 K. The amplitude of tip oscillation was set to 40 pm in both cases.
