Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

O: Fachverband Oberflächenphysik

O 48: Poster: 2D Materials beyond Graphene: TMDCs, Silicene and Relatives

O 48.13: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Vibronic spectroscopy of single phthalocyanine molecule on MoS₂/Au(111) — •Gaël Reecht, Nils Krane, Christian Lotze, and Katharina J Franke — Freie Universität Berlin , Berlin ,Germany

Transition metal dichalcogenides (TMDC) as MoS₂ are two-dimensional semiconducting materials. Single layer TMDC are particularly promising as they present a direct band-gap at the K point, a giant excitonic renormalization and a spin splitting of the valence band. Due to the presence of a band gap, MoS2 can also be used to decouple nanostructures from a metallic substrate. With a LT-STM, we studied phthalocyanine molecules (Zn-Pc and H₂-Pc) on MoS₂ grown previously on Au(111). As reported for other decoupling systems (graphene, NaCl, H-BN), we observe a high spatial resolution of the molecular orbitals on MoS₂. Moreover, for the molecular states with an energy in the gap of MoS₂, the lifetime of the state is strongly enhanced and a series of vibronic modes can be resolved. In the extreme case of the H₂-Pc, vibronic states with energies from few meV to hundreds of meV are observed. Finally, we compare the measured vibrational energies with results of DFT, Raman spectroscopy and LE-STM.