Ultrafast dynamics of wavelength-sensitive magnons in unconventional compensated semiconducting antiferromagnet
arxiv(2024)
摘要
Antiferromagnet is a promising candidate for the next generation spintronic
devices, benefiting from its ultrafast dynamics and spontaneous zero stray
field. However, the understanding of their ultrafast spin behaviors is lacking
due to the challenges of controlling/detecting the quenched net magnetization.
Unconventional compensated semiconducting antiferromagnets present strong
time-reversal symmetry breaking, spin splitting in the momentum space, and
suitable bandgap for optical control/detection. Thus, it is a powerful platform
to uncover the ultrafast dynamics of antiferromagnets. Here, we show an exotic
wavelength-dependent spin dynamic in the unconventional compensated
semiconducting antiferromagnet α-MnTe via time-resolved quadratic
magneto-optical Kerr effect measurement, where the probing photon energy of the
laser matches its bandgap. This direct excitation and detection of distinct
magnon modes reveal varying spin behaviors and time characteristics in a broad
temperature range. It originates from the spins triggered at different bands of
electronic structures and is depicted in an energy transfer model among
electrons, phonons, and magnons. Our study of exotic optical properties in this
unconventional semiconducting antiferromagnet fulfills the missing information
of spin evolution in the time domain and paves the way for its utilization in
ultrafast spintronic devices.
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