Ultrafast spin dynamics induced by infrared and Raman driven axial phonons
ORAL · Invited
Abstract
Axial phonons with large effective magnetic moments due to coupling with spin-orbit polarization can induce large effective magnetic fields on the electrons. Following our experimental demonstration of such a phenomenon in CeF3 with coherent infrared-active phonons excited by resonant circularly polarized terahertz pulses, I will show our recent results of time-resolved
phonon and spin dynamics in a few different settings, including Raman-active phonons in bulk CeF3 , two-dimensional (2D) monolayers, and magnetic heterostructures. We found that the axial lifetime can span two orders of magnitudes for phonon modes with different decoherence mechanisms. The induced spin effects, if any, may also drastically differ in magnitude and
dynamics from what would be expected from the simple spin-phonon hybridization model. Our results point out more unknown territories calling for theoretical and experimental investigations in the field of chiral phonon-spin coupling and the dynamic structural-property relationship in quantum materials.
phonon and spin dynamics in a few different settings, including Raman-active phonons in bulk CeF3 , two-dimensional (2D) monolayers, and magnetic heterostructures. We found that the axial lifetime can span two orders of magnitudes for phonon modes with different decoherence mechanisms. The induced spin effects, if any, may also drastically differ in magnitude and
dynamics from what would be expected from the simple spin-phonon hybridization model. Our results point out more unknown territories calling for theoretical and experimental investigations in the field of chiral phonon-spin coupling and the dynamic structural-property relationship in quantum materials.
*The works are supported by the National Science Foundation (DMR-2240106 and DMR-2327827), Welch Foundation (C-2128), and Natural Sciences and Engineering Research Council of Canada (NSERC).
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Publication: 1. Luo J et al "Large effective magnetic fields from chiral phonons in rare-earth halides." Science, 382(6671):698–702 (2023).
2. Lin T et al "Ultrafast Polarization-Resolved Phonon Dynamics in Monolayer Semiconductors." Nano Letters, 24(34):10592–10598 (2024).
3. Juraschek DM et al "Chiral phonons." Nature Physics, 21:1532–1540 (2025).
4. Luo J, Peela B et al, in preparation
5. Luo J, Milner V et al, in preparation
Presenters
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Hanyu Zhu
- Rice University
- Department of Materials Science and NanoEngineering, Rice University, Houston, TX 77005, USA