Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Inorganic/Organic Interfaces: Electronic Properties I
O 43.4: Talk
Wednesday, March 18, 2015, 11:30–11:45, MA 005
Many-body transitions in a single molecule visualized by scanning tunneling microscopy — •Fabian Schulz1, Mari Ijäs1, Robert Drost1, Sampsa K. Hämäläinen1, Ari P. Seitsonen2, Ari Harju1, and Peter Liljeroth1 — 1Aalto University School of Science, Department of Applied Physics, Espoo, Finland — 2École Normale Supérieure, Départment de Chimie, Paris, France
Scanning tunneling spectroscopy (STS) of molecular systems is usually interpreted in terms of single-particle electronic transitions. A prominent exception is the Kondo effect [1], a many-body state resulting from the interaction of an unpaired molecular spin with the conduction electrons of a metallic substrate. Probing excited states in single molecules by STS, we demonstrate many-body effects arising purely from electronic states confined in the molecule.
Cobalt phthalocyanine adsorbed on the moiré pattern of monolayer hexagonal boron nitride on Ir(111) [2] allows to carry out STS on molecules that are initially in different charge states [3]. The observed resonances are inconsistent with the single-particle interpretation of tunneling spectroscopy. Instead, these resonances can be understood as a series of many-body excitations of the different ground states of the molecule [4].
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F. Schulz et al., Phys. Rev. B 89, 235429 (2014).
F. Schulz et al., ACS Nano 7, 11121 (2013).
F. Schulz et al., Nature Phys., accepted.