Giant stress response of terahertz magnons in a spin-orbit Mott insulator

Hun-Ho Kim, Kentaro Ueda, Suguru Nakata, Peter Wochner, Andrew Mackenzie, Clifford Hicks, Giniyat Khaliullin, Huimei Liu (), Bernhard Keimer () and Matteo Minola ()
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Hun-Ho Kim: Max Planck Institute for Solid State Research
Kentaro Ueda: Max Planck Institute for Solid State Research
Suguru Nakata: Max Planck Institute for Solid State Research
Peter Wochner: Max Planck Institute for Solid State Research
Andrew Mackenzie: Max Planck Institute for Chemical Physics of Solids
Clifford Hicks: Max Planck Institute for Chemical Physics of Solids
Giniyat Khaliullin: Max Planck Institute for Solid State Research
Huimei Liu: Max Planck Institute for Solid State Research
Bernhard Keimer: Max Planck Institute for Solid State Research
Matteo Minola: Max Planck Institute for Solid State Research

Nature Communications, 2022, vol. 13, issue 1, 1-6

Abstract: Abstract Magnonic devices operating at terahertz frequencies offer intriguing prospects for high-speed electronics with minimal energy dissipation However, guiding and manipulating terahertz magnons via external parameters present formidable challenges. Here we report the results of magnetic Raman scattering experiments on the antiferromagnetic spin-orbit Mott insulator Sr2IrO4 under uniaxial stress. We find that the energies of zone-center magnons are extremely stress sensitive: lattice strain of 0.1% increases the magnon energy by 40%. The magnon response is symmetric with respect to the sign of the applied stress (tensile or compressive), but depends strongly on its direction in the IrO2 planes. A theory based on coupling of the spin-orbit-entangled iridium magnetic moments to lattice distortions provides a quantitative explanation of the Raman data and a comprehensive framework for the description of magnon-lattice interactions in magnets with strong spin-orbit coupling. The possibility to efficiently manipulate the propagation of terahertz magnons via external stress opens up multifold design options for reconfigurable magnonic devices.

Date: 2022
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DOI: 10.1038/s41467-022-34375-6

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