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

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) FePSe${}_3$. 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.

References in corpus (9)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Plane-wave based electronic structure calculations for correlated materials using dynamical mean-field theory and projected local orbitals
• Berry curvature in magnon-phonon hybrid systems
• Magnon-polarons in van der Waals antiferromagnet FePS3
• Self-consistent DFT+U method for real-space time-dependent density functional theory calculations
• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
• Spin dynamics slowdown near the antiferromagnetic critical point in atomically thin FePS3
• High pressure tuning of magnon-polarons in the layered antiferromagnet FePS${}_3$
• Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator

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