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Broken Kramers' degeneracy in altermagnetic MnTe
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abstract
Altermagnetism is a newly identified fundamental class of magnetism with vanishing net magnetization and time-reversal symmetry broken electronic structure. Probing the unusual electronic structure with nonrelativistic spin splitting would be a direct experimental verification of altermagnetic phase. By combining high-quality film growth and $in~situ$ angle-resolved photoemission spectroscopy, we report the electronic structure of an altermagnetic candidate, $\alpha$-MnTe. Temperature dependent study reveals the lifting of Kramers{\textquoteright} degeneracy accompanied by a magnetic phase transition at $T_N=267\text{ K}$ with spin splitting of up to $370\text{ meV}$, providing direct spectroscopic evidence for altermagnetism in MnTe.
Forward citations
Cited by 2 Pith papers
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Symmetry-Breaking Magneto-Optical Effects in Altermagnets
Uniaxial strain selectively breaks the symmetries that hide altermagnetism, producing detectable optical absorption and Kerr rotation that ordinary antiferromagnets do not show.
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Symmetry, microscopy and spectroscopy signatures of altermagnetism
A review of the symmetry, microscopic origin, and detection of altermagnetism, a collinear magnetic phase with alternating spin polarization in momentum space.
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