Magnon-polarons in cubic collinear Antiferromagnets

Abstract

We present a theoretical study of excitations formed by hybridization between magnons and phonons - magnon-polarons - in antiferromagnets. We first outline a general approach to determining which magnon and phonon modes can and cannot hybridize in a system thereby addressing the qualitative questions concerning magnon-polaron formation. As a specific and experimentally relevant case, we study Nickel Oxide quantitatively and find perfect agreement with the qualitative analysis, thereby highlighting the strength of the former. We find that there are two distinct features of antiferromagnetic magnon-polarons which differ from the ferromagnetic ones. First, hybridization between magnons and the longitudinal phonon modes is expected in many cubic antiferromagnetic structures. Second, we find that the very existence of certain hybridizations can be controlled via an external magnetic field, an effect which comes in addition to the ability to move the magnon modes relative to the phonons modes.

arXiv commentarXiv admin note: text overlap with arXiv:1808.09013

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• Observation of magnon-polarons in a uniaxial antiferromagnetic insulator
• Dynamic paramagnon-polarons in altermagnets
• Magnon polarons in the spin Peltier effect
• Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$
• Dynamic Magnetoelastic Boundary Conditions and the Pumping of Phonons
• Magnon decay theory of Gilbert damping in metallic antiferromagnets
• Giant spin Nernst effect in a two-dimensional antiferromagnet due to magnetoelastic coupling-induced gaps and interband transitions between magnon-like bands
• Magnon Polarons induced by a magnetic field gradient
• Theory of the low-temperature longitudinal spin Seebeck effect
• Magnonics in collinear magnetic insulating systems
• Transmon probe for quantum characteristics of magnons in antiferromagnets
• Tunable phonon-driven magnon-magnon entanglement at room temperature