Fig. 5: Non-trivial Dirac fermion charge localization.
From: Design and realization of topological Dirac fermions on a triangular lattice
a Spatially resolved constant height dI/dV maps taken at different energies in comparison with DFT simulations. The In atom positions are calibrated by mapping the pz orbital dominated states at 300 mV. Tuning the bias voltage to lower and eventually negative values result in distinct toggling of the LDOS maximum between the two inequivalent A/B parts of the unit cell. b Close-up of the DFT band structure and charge localization pattern at both valley momenta. The color code marks the charge maximum at the A (blue) and B (orange) sites. c DOS (black line) and A/B difference (color line) from DFT. Blue and orange areas correspond to energies with charge maxima at site A and B, respectively. d Differential conductance averaged over the entire unit cell and normalized difference of the dI/dV spectra measured at the A/B sites. The noisy behavior near EF = 0 V is attributed to the ZBA. STS data are taken at a constant tip to sample distance (see “Methods” section for more details). Normalized difference spectra and dI/dV maps taken at the various tip to sample distances agree qualitatively (see also Supplementary Note 5).
