Ultrafast amplification and non-linear magneto-elastic coupling of coherent magnon modes in an antiferromagnet

Autor:	Bossini, D., Pancaldi, M., Soumah, L., Basini, M., Mertens, F., Cinchetti, M., Satoh, T., Gomonay, O., Bonetti, S.
Rok vydání:	2021
Předmět:	Condensed Matter - Other Condensed Matter Condensed Matter - Mesoscale and Nanoscale Physics
Zdroj:	Phys. Rev. Lett. 127, 077202 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.127.077202
Popis:	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. Comment: 6 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2103.11203 Zobrazit plný text záznamu View this record from Arxiv