Figure 3.

Modulations of the electronic structure in strained FeSn/SrTiO₃(111) films. a, Atomic resolution image of perfect honeycomb lattice, set point: V = 3.0 V, I = 10 pA. b, A series of dI/dV spectra taken at sites marked in (a). The energy position of the Dirac point E_D is marked by the black arrow and dashed line, and the dip feature at −0.15 eV is marked by a cyan arrow. c, Atomic resolution image of distorted Sn honeycomb with stripe modulations, set point: V = 10 mV, I = 1.0 nA. d, A series of dI/dV spectra taken at sites marked in (c). The dI/dV spectra are classified into two groups, orange (taken on stripes) and cyan (taken between stripes). e, dI/dV spectra taken at sites on (orange) and between stripes (cyan), compared to the reference spectrum taken on perfect Sn honeycomb without stripe modulations. The pronounced peak at E = −0.36 eV (denoted with red arrow and dashed line) coincides with the Dirac point. f, dI/dV spectra taken within one-unit-cell of the strongly deformed honeycomb lattice, marked in (c). The energy position of the E_D is uniform within the deformed honeycomb lattice. The set point remains the same during the line dI/dV measurements.