Fig. 3. Benzene-ring-shaped Pb clusters on IrTe₂.

a, f STM topography, b–d, g–i dI/dV maps, and e, j STS spectra for a Pb hexamer and a pentamer, respectively. dI/dV maps are taken at the energies indicated in the STS spectra. Red, blue, and black lines in the STS spectra are obtained at the red, blue, and black Pb atoms indicated in a and f. The corresponding theoretical results are presented in k–t. k, p Atomic structure, l–n, q–s charge densities at the given energies (spin decoupled and spin summed, respectively), and o, t projected DOS, for a Pb hexamer and a pentamer on IrTe₂-(7 × 7), respectively. For the Pb hexamer, the localized DOS at red and blue Pb atoms is identical to each other. For the Pb pentamer, the red (dark blue) line denote the localized states at truncated end atoms (the other Pb atoms). Solid and dashed lines represent p_xy and p_z states, respectively.