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MA: Fachverband Magnetismus
MA 16: Magnonics I
MA 16.6: Vortrag
Dienstag, 19. März 2024, 10:45–11:00, EB 107
Unraveling the magnon-phonon hybridization in Fe3GeTe2 — •Namrata Bansal1, Qili Li1, Paul Nufer1, Lichuan Zhang2, Amir Abbas Haghighirad3, Yuriy Mokrousov2,4, and Wulf Wulfhekel1,3 — 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Peter Gruenberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1) Forschungszentrum, Juelich GmbH, D-52425 Juelich — 3Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 4Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany
We explore the dynamic interplay between magnons and phonons in Fe3GeTe2 (FGT) single crystals using inelastic scanning tunneling spectroscopy (ISTS) at 35 mK. ISTS has been widely employed to investigate the inelastic scattering of hot carriers off phonons or magnons, and in our study, we reveal magnon-phonon coupling in FGT. We find a significant interaction between magnons and acoustic phonons, giving rise to the formation of van Hove singularities through avoided level crossings and the hybridization of magnon and phonon bands within the material. We identify the hybridization points in the dispersion relations and contrast their energies with density functional theory calculations. These discoveries provide a foundation for tailoring the dynamic magnon-phonon coupling properties in two-dimensional materials.
Reference: Bansal, et al., arXiv: 2308.10774 (2023)
Keywords: Magnon phonon coupling; Fe3GeTe2; Scanning tunneling microscopy; Inelastic scanning tunneling spectroscopy; Two-dimensional ferromagnetic material