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TT: Fachverband Tiefe Temperaturen
TT 13: Focus Session: Magnetic Phenomena from Phonon Chirality and Angular Momentum II (joint session MA/TT)
TT 13.10: Vortrag
Dienstag, 18. März 2025, 12:00–12:15, H16
Chiral Phonons induced by Magnon-Phonon Coupling — •Hannah Bendin1, Alexander Mook2, Ingrid Mertig1, and Robin R. Neumann1,2 — 1Martin Luther University Halle-Wittenberg, Halle (Saale), Germany — 2Johannes Gutenberg University, Mainz, Germany
Chiral phonons, the quasiparticles of circularly polarized lattice vibrations, have recently been investigated due to a range of emerging phenomena. Notably, chiral phonons carry nonzero angular momentum. However, the systems in which they occur still require extensive research. Chiral phonons may, for example, be found in lattices with broken inversion symmetry. Alternatively, they can be induced by the coupling to magnons, the quasiparticles of spin excitations, thereby lifting time-reversal symmetry.
Here, we analyze how magnetoelastic coupling gives rise to magnon-phonon hybridization, which, in turn, generates phonon angular momentum. Conversely, we show how the phonon angular momentum and the spin of the magnons affects their coupling strength. This interplay between magnons and chiral phonons allows for the tunability of the phonon angular momentum.
Keywords: chiral phonons; magnons; magnon-phonon coupling; magnetoelastic coupling; phonon angular momentum