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  Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator

Zhang, Q., Ozerov, M., Viñas Boström, E., Cui, J., Suri, N., Jiang, Q., et al. (2021). Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator.

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2108.11619.pdf (Preprint), 2MB
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https://arxiv.org/abs/2108.11619 (Preprint)
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 Creators:
Zhang, Q.1, 2, Author
Ozerov, M.3, Author
Viñas Boström, E.4, Author           
Cui, J.1, Author
Suri, N.5, Author
Jiang, Q.2, Author
Wang, C.5, Author
Wu, F.1, Author
Hwangbo, K.2, Author
Chu, J.-H.2, Author
Xiao, D.5, Author
Rubio, A.4, 6, Author           
Xu, X.2, 7, Author
Affiliations:
1Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, ou_persistent22              
2Department of Physics, University of Washington, ou_persistent22              
3National High Magnetic Field Laboratory, Florida State University, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Department of Physics, Carnegie Mellon University, ou_persistent22              
6Center for Computational Quantum Physics, The Flatiron Institute, ou_persistent22              
7Department of Materials Science and Engineering, University of Washington, ou_persistent22              

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Free keywords: Condensed Matter, Materials Science, cond-mat.mtrl-sci
 Abstract: Emergent cooperative motions of individual degrees of freedom, i.e. collective excitations, govern the low-energy response of system ground states under external stimulations and play essential roles for understanding many-body phenomena in low-dimensional materials. The hybridization of distinct collective modes provides a route towards coherent manipulation of coupled degrees of freedom and quantum phases. In magnets, strong coupling between collective spin and lattice excitations, i.e., magnons and phonons, can lead to coherent quasi-particle magnon polarons. Here, we report the direct observation of a series of terahertz magnon polarons in a layered zigzag antiferromagnet FePS3 via far-infrared (FIR) transmission measurements. The characteristic avoided-crossing behavior is clearly seen as the magnon-phonon detuning is continuously changed via Zeeman shift of the magnon mode. The coupling strength g is giant, achieving 120 GHz (0.5 meV), the largest value reported so far. Such a strong coupling leads to a large ratio of g to the resonance frequency (g/{\omega}) of 4.5%, and a value of 29 in cooperativity (g^2/{\gamma}_{ph}{\gamma}_{mag}). Experimental results are well reproduced by first-principle calculations, where the strong coupling is identified to arise from phonon-modulated anisotropic magnetic interactions due to spin-orbit coupling. These findings establish FePS3 as an ideal testbed for exploring hybridization-induced topological magnonics in two dimensions and the coherent control of spin and lattice degrees of freedom in the terahertz regime.

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Language(s): eng - English
 Dates: 2021-08-26
 Publication Status: Published online
 Pages: 15
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2108.11619
 Degree: -

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