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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 13.2: Talk
Tuesday, March 18, 2025, 09:45–10:00, H16
Spin-lattice coupling in multiscale modeling: from angular momentum transfer to chiral phonons — •Markus Weißenhofer1,2, Philipp Rieger1, Sergiy Mankovsky3, Akashdeep Kamra5, MS Mrudul1, Hubert Ebert3, Ulrich Nowak4, and Peter M. Oppeneer1 — 1Uppsala University, Uppsala, Sweden — 2Freie Universität Berlin, Berlin, Germany — 3Ludwig Maximilian Universität, München, Germany — 4Universität Konstanz, Konstanz, Germany — 5Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Kaiserslautern, Germany
Transfer and manipulation of angular momentum is a key aspect in spintronics. Recently, it has been shown that angular momentum transfer between spins and lattice is possible on ultrashort timescales [1]. To contribute to the understanding of this transfer, we have developed a theoretical multiscale framework for spin-lattice coupling, which is linked to ab-initio calculations on the one hand and magnetoelastic continuum theory on the other [2], allowing for the study of a wide range of magnetomechanical phenomena. Here I will discuss how this framework can be used to calculate magnon-phonon coupling parameters, emphasizing the importance of a Dzyaloshinskii-Moriya type interaction for angular momentum transfer [2] and revealing the existence of chiral phonons in iron arising from a chirality-selective coupling [3]. [1] Tauchert al., Nature 602, 73 (2022); Luo et al., Science 382, 698 (2023). [2] Mankovsky et al., PRL 129, 067202 (2022); Weißenhofer et al., PRB 108, L060404 (2023). [3] Weißenhofer et al., arXiv:2411.03879.
Keywords: Spin-Lattice Coupling; Multiscale Modeling; Phonon Angular Momentum; Ultrafast Magnetism; Chiral Phonons