Crossover between Linear and Nonlinear Magno-phononics in FePS<sub>3</sub>

ORAL

Abstract

Control of magnetism and other physical properties of materials with coherent phonon excitations has been firmly established to be an efficient and unique avenue. Coherent phonons are typically excited through either linear or nonlinear pathway, while simultaneous activation and control of a single mode in both pathways remain elusive. Here, we demonstrate that Raman-active phonons can be concurrently linearly and quadratically driven by hybridizing with a magnon in a van der Waals antiferromagnet FePS3. By driving the magnon-phonon hybrid, also dubbed magnon polaron, with an intense broadband terahertz pulse, we not only observe the interference between the linear magnetic-dipole and nonlinear excitation pathways, but also achieve control of the weight of different channels by tuning either terahertz field strength or polarization. Moreover, utilizing the nonlinear excitation pathway, we are able to induce a nonequilibrium magnetic state with 2.5 millisecond lifetime. Our findings unlock a wide range of possibilities of phonon-mediated manipulation of material properties, ranging from generation of metastable magnetic states via displacive phonon excitation to phonon-Floquet engineering.

*We acknowledge support from the US Department of Energy, BES DMSE (data taking and analysis), and Gordon and Betty Moore Foundation’s EPiQS Initiative grant GBMF9459 (instrumentation). A.v.H. gratefully acknowledges funding by the Alexander von Humboldt foundation. Work at SNU was supported by the Leading Researcher Program of the National Research Foundation of Korea (grant number 2020R1A3B2079375).

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Publication: Tianchuang Luo*, Honglie Ning*, Batyr Ilyas*, Emil Viñas Boström, Alexander von Hoegen, Jaena Park, Junghyun Kim, Je-Geun Park, Dominik Juraschek, Angel Rubio, and Nuh Gedik†. Crossover between Linear and Nonlinear Magno-phononics in FePS3, to be submitted to Nature Physics

Presenters

  • Tianchuang Luo

    • Massachusetts Institute of Technology

Authors

  • Tianchuang Luo

    • Massachusetts Institute of Technology

  • Honglie Ning

    • Massachusetts Institute of Technology

  • Batyr Ilyas

    • Massachusetts Institute of Technology MIT

  • Emil Vinas Boström

    • Max Planck Institute for the Structure & Dynamics of Matter

  • Alexander von Hoegen

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
    • MIT

  • Jaena Park

    • Seoul National University

  • Junghyun Kim

    • Seoul National University

  • Je-Geun Park

    • Seoul National University
    • Seoul Natl Univ
    • Seoul National University (SNU)
    • jgpark10@snu.ac.kr

  • Dominik M Juraschek

    • Tel Aviv University

  • Angel Rubio

    • Max Planck Institute for the Structure & Dynamics of Matter
    • Max Planck Institute for the Structure and Dynamics of Matter
    • Max Planck Institute for the Structure &
    • Max Planck Institute for the Structure & Dynamics of Matter; Center for Computational Quantum Physics, Flatiron Institute
    • Center for Computational Quantum Physics, Flatiron Institute
    • Max Planck Institute for the Structure and Dynamics of Matter - Flatiron Institute
    • Max Planck Institute for Structure and Dynamics of Matter

  • Nuh Gedik

    • Massachusetts Institute of Technology