Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.11: Talk
Thursday, March 15, 2018, 17:45–18:00, MA 004
Apparent reversal of molecular orbitals reveals entanglement — Ping Yu1,2, Nemania Kocic1, Benjamin Siegert3, Jascha Repp1, and •Andrea Donarini3 — 1Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany — 2School of Physical Science and Technology, ShanghaiTech University, 201210 Shanghai, China — 3Institute of Theoretical Physics, University of Regensburg, 93053 Regensburg, Germany
The frontier orbital sequence of individual dicyanovinyl-substituted oligothiophene molecules is studied by means of scanning tunneling microscopy. On NaCl/Cu(111) the molecules are neutral, and the two lowest unoccupied molecular states are observed in the expected order of increasing energy. On NaCl/Cu(311), where the molecules are negatively charged, the sequence of two observed molecular orbitals is reversed, such that the one with one more nodal plane appears lower in energy. These experimental results, in open contradiction with a single-particle interpretation, are explained by a many-body theory predicting a strongly entangled doubly charged ground state.