Sujoy Karan, David Jacob, Michael Karolak, Christian Hamann, Yongfeng Wang, Alexander Weismann, Alexander I. Lichtenstein, Richard Berndt
Published 2015-06-15Version 1
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.
Comments: 8 pages, 8 figures (including supplemental material); accepted in Phys. Rev. Lett
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