| Title | Variations of vibronic states in densely-packed structures of molecules with intramolecular dipoles |
| Authors | Sergey Trishin, Christian Lotze, Johanna Richter, Gael Reecht, Nils Krane, Philipp Rietsch, Siegfried Eigler, Katharina J. Franke |
| Journal | Phys. Stat. Sol. A |
| 2023, pg. 2300105 |
| Abstract | Electrostatic potentials strongly affect molecular energy levels and charge states, providing the fascinating opportunity of molecular gating. Their influence on molecular vibrations remains less explored. Here, we investigate Ethyl-Diaminodicyanoquinone molecules on a monolayer of MoS$_2$ on Au(111) using scanning tunneling and atomic force microscopy and spectroscopy. These molecules exhibit a large dipole moment in gas phase, which we find to (partially) persist on the MoS$_2$ monolayer. The self-assembled structures consist of chains, where the dipoles of neighboring molecules are aligned anti-parallel. Thanks to the decoupling efficiency of the molecular states from the metal by the MoS$_2$ interlayer, we resolve vibronic states of the molecules, which vary in intensity depending on the molecular surrounding. We suggest that the vibrations are strongly damped by electrostatic interactions with the environment. |
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