Energetic and Spatial Mapping of Resonant Electronic Excitations

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• 作者：Andreas Krönlein ; Jens Kügel ; Konstantin A. Kokh ; Oleg. E. Tereshchenko ; Matthias Bode
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 30, 2016
• 年：2016
• 卷：120
• 期：25
• 页码：13843-13849
• 全文大小：387K
• 年卷期：0
• ISSN：1932-7455

文摘

In this article, we present a detailed study of the rotational movement of transition metal phthalocyanine molecules ((TM)Pc) on topological insulators by means of scanning tunneling microscopy and spectroscopy. Our data taken on two different systems, namely FePc on Bi₂Te₃ and MnPc on Sb₂Te₃, reveal that the energetic onset of the rotational motion coincides with the energetic position of the lowest unoccupied molecular orbital (LUMO). The strong correlation between molecular motion and tunneling into molecular orbitals is corroborated by a very good agreement between the spatial distribution of the switching frequency and the differential conductance map of the LUMO. These results lead to the conclusion that the driving mechanism of the rotational motion is resonant electronic excitation, which we were able to resolve energetically and spatially.