| Title | Correlation of Kondo effect and molecular conformation of the acceptor molecule in the TTF-TCNE charge transfer complex |
| Authors | Paul Stoll, Christian Lotze, Janina N. Ladenthin, Tobias R. Umbach, Isabel Fernandez-Torrente, Katharina J. Franke |
| Journal | Journal of Physics: Condensed Matter |
| Vol. 30, 2018, pg. 454002 |
| Abstract | A Kondo resonance has been observed on purely organic molecules in several combinations of charge transfer complexes on a metal surface. It has been regarded as a fingerprint of the transfer of one electron from the donor to the extended $pi$ orbital of the acceptor''''''''''''''''''''''''''''''''s LUMO. Here, we investigate the stoichiometric checkerboard structure of tetrathiafulvalene (TTF) and tetracyanoethylene (TCNE) on a Au(111) surface using scanning tunneling and atomic force microscopy at 4.8 K. We find a bistable state of the TCNE molecules with distinct structural and electronic properties. The two states represent different conformations of the TCNE within the structure. One of them exhibits a Kondo resonance, whereas the other one does not, despite of both TCNE types being singly charged. |
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