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Quantum Spin Stabilized Magnetic Levitation.

C C Rusconi1,2, V Pöchhacker1,2, K Kustura1,2

  • 1Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria.

Physical Review Letters
|November 4, 2017
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Summary
This summary is machine-generated.

We theoretically demonstrate stable levitation of magnetic nanoparticles using quantum spin effects, overcoming Earnshaw's theorem. This quantum levitation exploits the gyromagnetic effect, revealing new stable phases and entangled quantum states.

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Area of Science:

  • Quantum physics
  • Nanotechnology
  • Magnetism

Background:

  • Earnshaw's theorem traditionally prohibits stable static levitation of magnetic objects.
  • Nanoparticles possess unique quantum spin properties influencing their magnetic behavior.

Purpose of the Study:

  • To theoretically demonstrate stable levitation of a nonrotating magnetic nanoparticle in a static magnetic field.
  • To explore the quantum mechanical principles enabling such levitation.

Main Methods:

  • Theoretical analysis of a single magnetic domain nanoparticle.
  • Application of quantum spin dynamics and the gyromagnetic effect.
  • Derivation of a quadratic Hamiltonian for quantum fluctuations.

Main Results:

  • Stable levitation of a nanoparticle is shown to be possible, defying Earnshaw's theorem.
  • Two stable phases linked to Einstein-de Haas effect and Larmor precession are predicted.
  • Entanglement and squeezing are identified in the quantum state at equilibrium.

Conclusions:

  • Quantum spin properties, specifically the gyromagnetic effect, can enable stable magnetic nanoparticle levitation.
  • The study reveals novel quantum phenomena, including entanglement, in levitated nanomagnets.