Terahertz-frequency magnon upconversion unveiled by two-dimensional magnetic resonance spectroscopy
ORAL
Abstract
The dynamic manipulation of nonlinear phonon-phonon interactions has arisen as a potent scheme to functionalize the properties of materials. Extensions of such a strategy to collective spin-waves could provide an attractive avenue for high-speed information processing based upon nonlinear coupled magnonics. Here, we discover that intense terahertz (THz) fields can initiate coherent magnon upconversion. By using a suite of single-shot multidimensional THz spectroscopy measurements on the canted antiferromagnet ErFeO3, we unveil the unidirectional nature of the coupling between distinct magnon modes. Analysis of the temperature-dependent spin dynamics demonstrates that this energy transfer originates from a complex interplay of competing nonlinear pathways. Our results demonstrate a route to inducing directional energy transfer phenomena between coherent magnons in magnetic materials and pave the way for a new generation of magnonic signal processing devices.
*Z.Z., Z.-J.L., E.R.S. and K.A.N acknowledge support from the U.S. Department of Energy, Office of Basic Energy Sciences, under Award No. DESC0019126.F.Y.G. and E.B. acknowledge support from the Robert A. Welch Foundation (grant F-2092-20220331).Y.-C.C. acknowledges direct funding from the MIT UROP. S.C. and W.R. acknowledge support from the Science and Technology Commission of Shanghai Municipality (No.21JC1402600) and the National Natural Science Foundation of China (NSFC, Nos.12074242, 12074241).Work by J.B.C. and P.N. was partially supported by the Department of Energy, Photonics at Thermodynamic Limits Energy Frontier Research Center, under Grant No. DE-SC0019140. P.N. acknowledges support as a Moore Inventor Fellow through Grant No. GBMF8048 and gratefully acknowledges support from the Gordon and Betty Moore Foundation.
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Publication:Z. Zhang, F. Y. Gao, Y.-C. Chien, Z.-J. Liu, J. B. Curtis, E. R. Sung, X. Ma, W. Ren, S. Cao, P. Narang, A. v. Hoegen, E. Baldini, K. A. Nelson. "Nonlinear coupled magnonics: Terahertz field-driven magnon upconversion." arXiv:2207.07103.
