Chirality selective magnon-phonon hybridization and magnon-induced chiral phonons in a layered zigzag antiferromagnet

Jun Cui, Emil Viñas Boström, Mykhaylo Ozerov (), Fangliang Wu, Qianni Jiang, Jiun-Haw Chu, Changcun Li, Fucai Liu, Xiaodong Xu, Angel Rubio () and Qi Zhang ()
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Jun Cui: Nanjing University
Emil Viñas Boström: Max Planck Institute for the Structure and Dynamics of Matter
Mykhaylo Ozerov: Florida State University
Fangliang Wu: Nanjing University
Qianni Jiang: University of Washington
Jiun-Haw Chu: University of Washington
Changcun Li: University of Electronic Science and Technology of China
Fucai Liu: University of Electronic Science and Technology of China
Xiaodong Xu: University of Washington
Angel Rubio: Max Planck Institute for the Structure and Dynamics of Matter
Qi Zhang: Nanjing University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Two-dimensional (2D) magnetic systems possess versatile magnetic order and can host tunable magnons carrying spin angular momenta. Recent advances show angular momentum can also be carried by lattice vibrations in the form of chiral phonons. However, the interplay between magnons and chiral phonons as well as the details of chiral phonon formation in a magnetic system are yet to be explored. Here, we report the observation of magnon-induced chiral phonons and chirality selective magnon-phonon hybridization in a layered zigzag antiferromagnet (AFM) FePSe3. With a combination of magneto-infrared and magneto-Raman spectroscopy, we observe chiral magnon polarons (chiMP), the new hybridized quasiparticles, at zero magnetic field. The hybridization gap reaches 0.25 meV and survives down to the quadrilayer limit. Via first principle calculations, we uncover a coherent coupling between AFM magnons and chiral phonons with parallel angular momenta, which arises from the underlying phonon and space group symmetries. This coupling lifts the chiral phonon degeneracy and gives rise to an unusual Raman circular polarization of the chiMP branches. The observation of coherent chiral spin-lattice excitations at zero magnetic field paves the way for angular momentum-based hybrid phononic and magnonic devices.

Date: 2023
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DOI: 10.1038/s41467-023-39123-y

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