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Quantum phase transition in a single-molecule quantum dot

Author

Listed:
  • Nicolas Roch

    (Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France)

  • Serge Florens

    (Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France)

  • Vincent Bouchiat

    (Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France)

  • Wolfgang Wernsdorfer

    (Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France)

  • Franck Balestro

    (Institut Néel, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble cedex 9, France)

Abstract

Quantum dots: Phase transition in a single molecule Many of the fascinating properties of strongly correlated electron systems such as high-temperature superconductors, are believed to be governed by quantum criticality, which forces a system evolve between two distinct, competing ground states and usually involves a zero-temperature magnetic phase transition. Roch et al. now demonstrate an intriguing example of such a quantum phase transition in a nanoscale device, consisting of a C60 quantum dot between two electrodes. The quantum dot is operated in the Kondo regime and the quantum phase transition, induced by tuning of a gate voltage, consists of a crossing of two different types of electron spin states (singlet and triplet) on the quantum dot. The strong electronic coupling between the quantum dot and the metallic contacts provides the necessary strong electron correlations to observe quantum critical behaviour. The authors believe that their work may offer new directions for control and tunability in molecular spintronics.

Suggested Citation

  • Nicolas Roch & Serge Florens & Vincent Bouchiat & Wolfgang Wernsdorfer & Franck Balestro, 2008. "Quantum phase transition in a single-molecule quantum dot," Nature, Nature, vol. 453(7195), pages 633-637, May.
    • Handle: RePEc:nat:nature:v:453:y:2008:i:7195:d:10.1038_nature06930
    DOI: 10.1038/nature06930
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    Cited by:

    1. R. Žitko & G. G. Blesio & L. O. Manuel & A. A. Aligia, 2021. "Iron phthalocyanine on Au(111) is a “non-Landau” Fermi liquid," Nature Communications, Nature, vol. 12(1), pages 1-9, December.

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