Coherent helicity-dependent spin-phonon oscillations in the ferromagnetic van der Waals crystal CrI3

P. Padmanabhan (), F. L. Buessen, R. Tutchton, K. W. C. Kwock, S. Gilinsky, M. C. Lee, M. A. McGuire, S. R. Singamaneni, D. A. Yarotski, A. Paramekanti (), J.-X. Zhu () and R. P. Prasankumar ()
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P. Padmanabhan: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
F. L. Buessen: University of Toronto
R. Tutchton: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
K. W. C. Kwock: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
S. Gilinsky: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
M. C. Lee: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
M. A. McGuire: Materials Science and Technology Division, Oak Ridge National Laboratory
S. R. Singamaneni: The University of Texas at El Paso
D. A. Yarotski: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
A. Paramekanti: University of Toronto
J.-X. Zhu: Center for Integrated Nanotechnologies, Los Alamos National Laboratory
R. P. Prasankumar: Center for Integrated Nanotechnologies, Los Alamos National Laboratory

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The discovery of two-dimensional systems hosting intrinsic magnetic order represents a seminal addition to the rich landscape of van der Waals materials. CrI3 is an archetypal example, where the interdependence of structure and magnetism, along with strong light-matter interactions, provides a new platform to explore the optical control of magnetic and vibrational degrees of freedom at the nanoscale. However, the nature of magneto-structural coupling on its intrinsic ultrafast timescale remains a crucial open question. Here, we probe magnetic and vibrational dynamics in bulk CrI3 using ultrafast optical spectroscopy, revealing spin-flip scattering-driven demagnetization and strong transient exchange-mediated interactions between lattice vibrations and spin oscillations. The latter yields a coherent spin-coupled phonon mode that is highly sensitive to the driving pulse’s helicity in the magnetically ordered phase. Our results elucidate the nature of ultrafast spin-lattice coupling in CrI3 and highlight its potential for applications requiring high-speed control of magnetism at the nanoscale.

Date: 2022
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DOI: 10.1038/s41467-022-31786-3

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