Figure 2: Dodecagonal square-triangle tiling measured by STM.
From: Interface-driven formation of a two-dimensional dodecagonal fullerene quasicrystal
(a) High-resolution UHV-STM image of C60 on 2Pt–Pt3Ti(111) (scale bar, 3 nm; Uset=−2.03 V, Iset=0.47 nA, 77 K). The HOMO of fullerenes facing the surface with a hexagon is imaged under these conditions and the characteristic dip in the middle of the HOMO is clearly resolved. One dodecagon and the local structures reproduced in c,d are indicated in white. (b) Square–triangle tiling extracted from a, with colour-coded decomposition into different types of approximants, see text. (c–e) Three types of local vertex configurations around one fullerene (marked green) (scale bar, 1 nm): (c) (32.4.3.4), (d) (33.42), (e) (36). (f) FFT of the STM image with 12-fold symmetry.
