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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: (Multi)ferroic States: From Fundamentals to Applications (III)
KFM 8.6: Vortrag
Dienstag, 18. März 2025, 11:00–11:15, H9
Phonon-induced multiferroicity — Carolina Paiva1, Michael Fechner2, and •Dominik Juraschek3 — 1Tel Aviv University, Tel Aviv, Israel — 2Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 3Eindhoven University of Technology, Eindhoven, Netherlands
A well-known mechanism for multiferroicity involves an electric polarization arising from a spatially varying magnetization, such as a spin spiral or cycloid. Reciprocally, optical phonons can produce a magnetization through a temporally varying electric polarization, an effect also known as dynamical multiferroicity. Here, we go a step beyond this phenomenon and describe a mechanism by which both a ferroelectric polarization and a magnetization can be created in nonpolar, nonmagnetic materials. Using a combination of phenomenological modeling and first-principles calculations, we demonstrate that a ferroelectric polarization, a magnetization, or both simultaneously can be transiently induced by an ultrashort laser pulse upon linearly, circularly, or elliptically polarized excitation of phonon modes in γ-LiBO2. The direction and magnitude of the multiferroic polarization can be controlled by the chirality of the laser pulse and the phonon modes, offering a pathway for controlling multiferroicity and magnetoelectricity on ultrafast timescales.
Keywords: multiferroics; chiral phonons; nonlinear phononics; terahertz; ultrafast dynamics