2025/11/11 by Hannah Bendin, Bendin, Hannah, Alexander Mook +5 · 1 citation
Physics and Astronomy · Materials Science · #Topological Materials and Phenomena #Magnetic properties of thin films #Chemical and Physical Properties of Materials
paper · pdf · doi:10.48550/arxiv.2511.08357
In altermagnets, the magnon bands are anisotropically spin-split in reciprocal space without relativistic or dipolar spin-spin interactions. In this work, we theoretically study magnons and phonons coupled by spin-lattice interaction in a two-dimensional square-lattice d-wave altermagnet. We show that phonon-chirality-selective magnon-phonon hybridization can be caused by interfacial Dzyaloshinskii-Moriya interaction leading to the emergence of hybrid quasiparticles that possess finite phonon angular momentum. These hybrid quasiparticles are called magnon polarons and consist of spin-polarized magnons and chiral phonons. Their phonon angular momentum texture follows the d-wave character of the magnon spin texture opening up the possibility of phononic counterparts to the electronic response effects in altermagnets, such as a phonon angular momentum splitter effect, i.e., the generation of a transverse phonon angular momentum current induced by a temperature gradient -- the bosonic analog of the spin-splitter effect.