Single-molecule quantum dot as a Kondo simulator

R. Hiraoka, E. Minamitani (), R. Arafune, N. Tsukahara, S. Watanabe, M. Kawai and N. Takagi ()
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R. Hiraoka: The University of Tokyo
E. Minamitani: The University of Tokyo
R. Arafune: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science
N. Tsukahara: The University of Tokyo
S. Watanabe: The University of Tokyo
M. Kawai: The University of Tokyo
N. Takagi: The University of Tokyo

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Structural flexibility of molecule-based systems is key to realizing the novel functionalities. Tuning the structure in the atomic scale enables us to manipulate the quantum state in the molecule-based system. Here we present the reversible Hamiltonian manipulation in a single-molecule quantum dot consisting of an iron phthalocyanine molecule attached to an Au electrode and a scanning tunnelling microscope tip. We precisely controlled the position of Fe2+ ion in the molecular cage by using the tip, and tuned the Kondo coupling between the molecular spins and the Au electrode. Then, we realized the crossover between the strong-coupling Kondo regime and the weak-coupling regime governed by spin–orbit interaction in the molecule. The results open an avenue to simulate low-energy quantum many-body physics and quantum phase transition through the molecular flexibility.

Date: 2017
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DOI: 10.1038/ncomms16012

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