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Condensed Matter > Other Condensed Matter
Title: Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet
(Submitted on 20 Mar 2021 (v1), last revised 12 Aug 2021 (this version, v2))
Abstract: We investigate the role of domain walls in the ultrafast magnon dynamics of an antiferromagnetic NiO single crystal in a pump-probe experiment with variable pump photon energy. Analysing the amplitude of the energy-dependent photo-induced ultrafast spin dynamics, we detect a yet unreported coupling between the material's characteristic THz- and a GHz-magnon modes. We explain this unexpected coupling between two orthogonal eigenstates of the corresponding Hamiltonian by modelling the magneto-elastic interaction between spins in different domains. We find that such interaction, in the non-linear regime, couples the two different magnon modes via the domain walls and it can be optically exploited via the exciton-magnon resonance.
Submission history
From: Olena Gomonay [view email][v1] Sat, 20 Mar 2021 16:26:52 GMT (1707kb,D)
[v2] Thu, 12 Aug 2021 07:39:02 GMT (3107kb,D)
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