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Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
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The anomalous Hall effect, commonly observed in metallic magnets, has been established to originate from the time-reversal symmetry breaking by an internal macroscopic magnetization in ferromagnets or by a non-collinear magnetic order. Here we observe a spontaneous anomalous Hall signal in the absence of an external magnetic field in an epitaxial film of MnTe, which is a semiconductor with a collinear antiparallel magnetic ordering of Mn moments and a vanishing net magnetization. The anomalous Hall effect arises from an unconventional phase with strong time-reversal symmetry breaking and alternating spin polarization in real-space crystal structure and momentum-space electronic structure. The anisotropic crystal environment of magnetic Mn atoms due to the non-magnetic Te atoms is essential for establishing the unconventional phase and generating the anomalous Hall effect.
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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