Coherent Spin-Phonon Coupling in the Layered Ferrimagnet Mn3Si2Te6

We utilize ultrafast photoexcitation to drive coherent lattice oscillations in the layered ferrimagnetic crystal Mn3Si2Te6, which significantly stiffen below the magnetic ordering temperature. We suggest that this is due to an exchange-mediated contraction of the lattice, stemming from strong magnet...

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Bibliographic Details
Published in:arXiv.org 2023-08
Main Authors: Martinez, L M, Liu, Y, Petrovic, C, Haldar, S, Griepe, T, Atxitia, U, Campbell, M, Pettes, M, Prasankumar, R P, Santos, E J G, Singamaneni, S R, Padmanabhan, P
Format: Article
Language:English
Subjects:
Coupling
Crystal lattices
Electron spin
Ferrimagnets
Magnets
Optical control
Phonons
Photoexcitation
Spin dynamics
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Summary:We utilize ultrafast photoexcitation to drive coherent lattice oscillations in the layered ferrimagnetic crystal Mn3Si2Te6, which significantly stiffen below the magnetic ordering temperature. We suggest that this is due to an exchange-mediated contraction of the lattice, stemming from strong magneto-structural coupling in this material. Additionally, simulations of the transient incoherent dynamics reveal the importance of spin relaxation channels mediated by optical and acoustic phonon scattering. Our findings highlight the importance of spin-lattice coupling in van der Waals magnets and a promising route for their dynamic optical control through their intertwined electronic, lattice, and spin degrees of freedom.
ISSN:2331-8422