期刊
NANO LETTERS
卷 15, 期 7, 页码 4406-4411出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00711
关键词
Single-electron tunneling; single molecule; atomic force microscopy; charge sensing; level broadening
类别
资金
- Deutsche Forschungsgemeinschaft [GRK 1570]
- Volkswagen Foundation through its Lichtenberg program
- Swiss National Science Foundation [200021-147143]
- European Commission (EC) FP7 ITN MOLESCO [606728]
Individual molecules at the edges of self-assembled islands grown on Ag(111) can be deliberately switched hi their Charge state with the electric field from a scanning-probe tip. Close to the threshold voltage for a charge state transition, periodic switching of the charge is directly driven by the cantilever motion in frequency-modulated atomic force microscopy (AFM), as can be deduced from the signature in the measured frequency shift. In this regime, the integrated frequency shift yields the tip sample force that is due to a single additional electron. Further, the signature of the dynamic charging response provides information on the electronic coupling of the molecule to the substrate. In analogy to previous experiments on quantum dots, this may also be used in the future to access excited state properties of single molecules from AFM experiments.
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