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posted on 11.10.2017, 13:31 by Ben Warner, Toby Gill, Cyrus Hirjibehedin
(A) STM topographic image of FePc molecules on silicene/ZrB2 (17.53 nm x 8.71
nm; Vset = -1 V, Iset = 0.5 nA). The cross-shaped molecules adsorb at the edges of the striped
domains. The linear nature of these domains enables the creation chains of molecules on the
surface. The frontier molecular orbital can also be observed. In the inset, white lines have
been added between the silicene ‘up’ atoms to highlight the lattice and purple lines mark the
binding angle. (B) Same topographic image at positive bias (Vset = +1 V, Iset = 0.5 nA). The
molecules now have a triangular profile, and the domain boundaries, as well as kinks that
appear when a domain boundary shifts to a neighboring row of Si ‘up’ atoms, are more clearly
resolved. (C) dI/dV map of a FePc molecule bound upon a silicene domain boundary taken at
-0.7 V shows that the feature observed is the frontier orbital of the FePc molecule. (D) Lobes
of the dI/dV map plotted over topographic image of the molecule show the lobes align with
the molecule (Vset= -0.7V, Iset=0.5 nA).