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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Quantum Einstein-de Haas effect.

Marc Ganzhorn1, Svetlana Klyatskaya2, Mario Ruben2,3

  • 1Institut Néel, CNRS &Université Joseph Fourier, BP 166, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France.

Nature Communications
|April 30, 2016
PubMed
Summary
This summary is machine-generated.

The Einstein-de Haas experiment, demonstrating magnetism

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Area of Science:

  • Quantum physics
  • Nanotechnology
  • Condensed matter physics

Background:

  • The Einstein-de Haas experiment shows macroscopic magnets rotate when their magnetization changes.
  • This phenomenon illustrates the conservation of angular momentum and energy in electronic spins.
  • Angular momentum conservation applies to both macroscopic ensembles and individual spins due to rotational invariance.

Purpose of the Study:

  • To propose and demonstrate an experimental realization of the Einstein-de Haas experiment at the single-spin level.
  • To investigate the conservation of angular momentum and energy for a single spin.
  • To explore the suppression of quantum tunnelling of magnetization in single-molecule magnets.

Main Methods:

  • Coupling a single-molecule magnet to a nanomechanical resonator.
  • Utilizing the principles of the Einstein-de Haas experiment at the nanoscale.
  • Observing the mechanical response of the resonator to changes in the molecule's spin state.

Main Results:

  • Successfully adapted the Einstein-de Haas experiment for a single-spin system.
  • Demonstrated the conservation of total angular momentum and energy for the single-molecule magnet's spin.
  • Achieved total suppression of the molecule's quantum tunnelling of magnetization.

Conclusions:

  • The study validates the conservation laws at the single-spin level.
  • This work opens new avenues for controlling quantum phenomena using mechanical systems.
  • It provides a novel method for probing and manipulating spin properties in single molecules.