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Research Article

Reversible switching of Kondo resonance in a single-molecule junction

Yuqing Xing1, Hui Chen1,2( ), Bin Hu1, Yuhan Ye1, Werner A. Hofer1, Hong-Jun Gao1,2( )
Institute of Physics Chinese Academy of Sciences and University of Chinese Academy of SciencesBeijing 100190 China
Songshan Lake Materials LaboratoryDongguan 523808 China
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Abstract

The control of the Kondo effect is of great interest in single-molecule junction due to its potential applications in spin based electronics. Here, we demonstrate that the Kondo effect is reversibly switched on and off in an iron phthalocyanine (FePc) single-molecule junction by using a superconducting Nb tip. In a scanning tunneling microscope-based Nb-insulator-FePc-Au junction, we achieve a reversible switching between the Kondo dip and inelastic electronic tunneling spectra by simply adjusting the tip-sample distance to tune the tunnel coupling at low temperature. Further approaching the tip leads to the picking up of the molecule to the tip apex, which transfers the geometry of the single-molecule junction into a Nb-FePc-insulator-Au type. As the molecule forms an effective magnetic impurity embedded into the superconducting ground states of the Nb tip, the out-gap Kondo dip switched to an in-gap Yu–Shiba–Rusinov state. Our results open up a new route for manipulating the Kondo effect within a single-molecule junction.

Keywords

iron phthalocyanine (FePc)scanning tunneling microscopesuperconducting tipKondo resonanceinelastic electron tunnelingYu–Shiba–Rusinov states

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Nano Research
Volume 15 Issue 2,
February 2022
Pages 1466-1471
DOI: 10.1007/s12274-021-3688-1
Cite this article:
Xing Y, Chen H, Hu B, et al. Reversible switching of Kondo resonance in a single-molecule junction. Nano Research, 2022, 15(2): 1466-1471. https://doi.org/10.1007/s12274-021-3688-1
Topics:
Scanning tunneling microscopy

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Received: 11 April 2021
Revised: 02 June 2021
Accepted: 16 June 2021
Published: 23 July 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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