Shifting the Voltage Drop in Electron Transport through a Single Molecule

Sujoy Karan , David Jacob , Michael Karolak , Christian Hamann , Yongfeng Wang , Alexander Weismann , Alexander I. Lichtenstein , Richard Berndt

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classification ❄️ cond-mat.mes-hall cond-mat.str-el

keywords contactedmoleculevoltageaccordingalongappearsaxiscalculations

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A Mn-porphyrin was contacted on Au(111) in a low-temperature scanning tunneling microscope (STM). Differential conductance spectra show a zero-bias resonance that is due to an underscreened Kondo effect according to many-body calculations. When the Mn center is contacted by the STM tip, the spectrum appears to invert along the voltage axis. A drastic change in the electrostatic potential of the molecule involving a small geometric relaxation is found to cause this observation.

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Shifting the Voltage Drop in Electron Transport through a Single Molecule

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