Figure 4: Orientation dependence of the Lamb shift. | Nature Communications

Figure 4: Orientation dependence of the Lamb shift.

From: Sub-nanometre control of the coherent interaction between a single molecule and a plasmonic nanocavity

Figure 4

(a) Schematics showing orientation-dependent measurement of Fano spectra. The red dashed line shows the trajectory of the STM tip around the ZnPc molecule, and the green and orange arrows represent two degenerate transition dipole moments and of the molecule, respectively. (b) Two typical Fano spectra (−2.5 V, 200 pA, 5 s) for the tip orientation at θ=0° (lobe) and θ=45° (in between lobes), respectively. (c) Colour plot of experimental STML spectral intensity around the Fano dip showing periodic variations of the Lamb shift over θ=0−360°. (d) Theoretical simulation of the Fano spectra in (c), taking into account the periodic variation of the molecule’s self-interaction (Lamb shift).

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