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  • Letter
  • Open Access

Dirac magnon pairing via pumping

Vladimir A. Zyuzin

  • Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden

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Phys. Rev. B 104, L100414 – Published 21 September, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L100414

Abstract

We study pumping of magnons to the Dirac points of magnon's Brillouin zone of a ferromagnet on a honeycomb lattice. In particular, we consider second-order Suhl process, when due to interaction between magnons, a pair of magnons is created due to absorption of two electromagnetic wave quanta. We introduce a bosonic analog of the Cooper ladder for the magnon pair, which is shown to enhance the pairing of magnons at the Dirac points. As a result of pairing of the Dirac magnons, the system becomes unstable towards formation of a magnetic state with zero magnetization—the Dirac magnon paired state. In this case the resonant frequency of the pump equals to that of energy of the Dirac points. Our estimates suggest that the Dirac magnon paired state can be found in the CrBr3 or CrCl3 ferromagnet below in vicinity of the Curie temperature.

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Phys. Rev. B 104, L100414– Published 21 September, 2021
  • Received 10 February 2021
  • Accepted 26 August 2021
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