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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Dirac magnons pairing via pumping
(Submitted on 22 Dec 2020 (v1), last revised 27 Sep 2022 (this version, v4))
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 or reduced 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 CrBr$_{3}$ or CrCl$_{3}$ ferromagnet below in vicinity of the Curie temperature.
Submission history
From: Vladimir Zyuzin [view email][v1] Tue, 22 Dec 2020 14:37:00 GMT (74kb,D)
[v2] Tue, 9 Feb 2021 11:02:11 GMT (85kb,D)
[v3] Tue, 11 May 2021 10:22:48 GMT (150kb,D)
[v4] Tue, 27 Sep 2022 15:34:02 GMT (150kb,D)
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