Figure 3: Electronic asymmetry in images of DyPc2.
From: Sub-molecular modulation of a 4f driven Kondo resonance by surface-induced asymmetry
(a) Topographic image (4.5 × 4.5 nm, Vset=0.1 V, Iset= 0.1 nA) of DyPc2 in two mirror symmetric configurations. A clear asymmetry is observed, which obeys the same mirror symmetry as the underlying binding. This suggests that it is related to the relative orientation of the fourfold symmetric molecule on the fourfold symmetric surface. (b) Topographic images (4.5 × 4.5 nm, Iset=0.1 nA) of DyPc2 on Cu(001) at various bias voltages. The ligand state of the top Pc ring is observed at −0.7 V (ref. 14). For small-positive biases, a clear asymmetry can be seen in the ligands that persists at larger-positive voltages but is absent at negative voltages.
