Large Photoelasticity in Topological Antiferromagnet Mn3Sn Studied by Coherent Acoustic Phonon
Abstract
We investigate the role of ultrafast strain on the electronic and optical responses in topological antiferromagnet Mn3Sn thin films using near-infrared femtosecond pump-probe spectroscopy. Coherent acoustic phonons are generated and exhibit remarkably large oscillations in differential transmission exceeding 1% in amplitude. Our quantitative analysis reveals that Mn3Sn possesses an unusually large near-infrared photoelastic coefficient, several times greater than those in conventional materials, indicating a remarkable sensitivity of the electronic states to lattice distortions. This work establishes a quantitative framework for understanding and utilizing strain-induced responses in Mn3Sn, paving a foundation for exploring coupled electron-phonon-magnon dynamics for ultrafast straintronics.
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