Quantum phase transition in a single-molecule quantum dot

Nicolas Roch, Serge Florens, Vincent Bouchiat, Wolfgang Wernsdorfer and Franck Balestro ()
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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

Nature, 2008, vol. 453, issue 7195, 633-637

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.

Date: 2008
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DOI: 10.1038/nature06930

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