Coherent THz Spin Dynamics in Antiferromagnets Beyond the Approximation of the Néel vector
arxiv(2023)
摘要
Controlled generation of coherent spin waves with highest possible
frequencies and the shortest possible wavelengths is a cornerstone of
spintronics and magnonics. Here, using the Heisenberg antiferromagnet RbMF_3,
we demonstrate that laser-induced THz spin dynamics corresponding to pairs of
mutually coherent counter propagating spin waves with the wavevectors up to the
edge of the Brillouin zone cannot be understood in terms of magnetization and
antiferromagnetic (Néel) vectors, conventionally used to describe spin waves.
Instead, we propose to model such spin dynamics using the spin correlation
function. We derive a quantum-mechanical equation of motion for the latter and
emphasize that, unlike the magnetization and antiferromagnetic vectors the spin
correlations in antiferromagnets do not exhibit inertia.
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关键词
coherent thz spin dynamics,antiferromagnets
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