Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.25: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Electronic “chirality” of transition metal phthalocyanine molecules adsorbed to noble metal surfaces — •Jacob Senkpiel, Jens Kügel, Pin-Jui Hsu, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II,Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

We have investigated the transition metal phthalocyanine (TM-Pc) molecules MnPc and CuPc on Cu(001) and Ag(001) by means of low-temperature scanning tunneling microscopy and spectroscopy measurements (T ≈ 5 K). It is well-known that the symmetry axes of the adsorbed TM-Pc molecules are rotated with respect to the four-fold symmetry axis of noble metal (001)-surfaces. Symmetry considerations suggest that this should generally lead to chiral electronic distortion, which has been ascribed to charge transfer between the TM-Pc and the substrate. However, chirality was clearly observed only for some molecules, such as ZnPc on Cu(001) [1] and CuPc/NiPc on Ag(001) [2], while the topography of others appeared to be almost unaffected [2]. In this contribution we will present a detailed investigation of the molecular shape and the resulting electronic structure. Our results suggest that chirality is indeed a general phenomenon for TM-Pc’s on four-fold symmetric substrates.

[1] Chen et al.,Appl. Phys. Lett. 100, 081602 (2012)
Mugarza et al., Phys. Rev. B 85, 155437 (2012)