Antiferromagnetic Magnons as Highly Squeezed Fock States underlying Quantum Correlations

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2019
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Thingstad, Even
Duine, Rembert A.
Brataas, Arne
Sudbø, Asle
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Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a Néel ordered configuration, a spin-flip restricted to one of the sublattices is called a sublattice magnon. We show that an antiferromagnetic spin-up magnon is composed of a quantum superposition of states with n+1 spin-up and n spin-down sublattice magnons and is thus an enormous excitation despite its unit net spin. Consequently, its large sublattice spin can amplify its coupling to other excitations. Employing von Neumann entropy as a measure, we show that the antiferromagnetic eigenmodes manifest a high degree of entanglement between the two sublattices, thereby establishing antiferromagnets as reservoirs for strong quantum correlations. Based on these insights, we outline strategies for exploiting the strong quantum character of antiferromagnetic (squeezed) magnons and give an intuitive explanation for recent experimental and theoretical findings in antiferromagnetic magnon spintronics.

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ISO 690KAMRA, Akashdeep, Even THINGSTAD, Gianluca RASTELLI, Rembert A. DUINE, Arne BRATAAS, Wolfgang BELZIG, Asle SUDBØ, 2019. Antiferromagnetic Magnons as Highly Squeezed Fock States underlying Quantum Correlations. In: Physical Review B. 2019, 100(17), 174407. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.100.174407
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@article{Kamra2019-04-09T09:18:01ZAntif-45612.2,
  year={2019},
  doi={10.1103/PhysRevB.100.174407},
  title={Antiferromagnetic Magnons as Highly Squeezed Fock States underlying Quantum Correlations},
  number={17},
  volume={100},
  issn={2469-9950},
  journal={Physical Review B},
  author={Kamra, Akashdeep and Thingstad, Even and Rastelli, Gianluca and Duine, Rembert A. and Brataas, Arne and Belzig, Wolfgang and Sudbø, Asle},
  note={Article Number: 174407}
}
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2019-11-06 07:22:18
Veröffentlichung in Physical Review B
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