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Quantum Einstein-de Haas effect

Author

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  • Marc Ganzhorn

    (Institut Néel, CNRS & Université Joseph Fourier
    Present address: Department of Physics, University of Basel, Klingerlbergstrasse 82, 4056 Basel, Switzerland.)

  • Svetlana Klyatskaya

    (Institut of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT))

  • Mario Ruben

    (Institut of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)
    Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg)

  • Wolfgang Wernsdorfer

    (Institut Néel, CNRS & Université Joseph Fourier)

Abstract

The classical Einstein-de Haas experiment demonstrates that a change of magnetization in a macroscopic magnetic object results in a mechanical rotation of this magnet. This experiment can therefore be considered as a macroscopic manifestation of the conservation of total angular momentum and energy of electronic spins. Since the conservation of angular momentum is a consequence of a system’s rotational invariance, it is valid for an ensemble of spins in a macroscopic ferromaget as well as for single spins. Here we propose an experimental realization of an Einstein-de Haas experiment at the single-spin level based on a single-molecule magnet coupled to a nanomechanical resonator. We demonstrate that the spin associated with the single-molecule magnet is then subject to conservation of total angular momentum and energy, which results in a total suppression of the molecule’s quantum tunnelling of magnetization.

Suggested Citation

  • Marc Ganzhorn & Svetlana Klyatskaya & Mario Ruben & Wolfgang Wernsdorfer, 2016. "Quantum Einstein-de Haas effect," Nature Communications, Nature, vol. 7(1), pages 1-5, September.
  • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11443
    DOI: 10.1038/ncomms11443
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