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Induced Monolayer Altermagnetism in MnP(S,Se)₃ and FeSe
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Induced Monolayer Altermagnetism in MnP(S,Se)₃ and FeSe
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Altermagnets (AM) are a recently discovered third class of collinear magnets, distinctly different from conventional ferromagnets (FM) and antiferromagnets (AF). AM have been actively researched in the last few years, but two aspects so far remain unaddressed: (1) Are there realistic 2D single-layer altermagnets? And (2) is it possible to functionalize a conventional AF into AM by external stimuli? In this paper we address both issues by demonstrating how a well-known 2D AF, MnP(S,Se)$_3$ can be functionalized into strong AM by applying out-of-plane electric field. Of particular interest is that the induced altermagnetism is of a higher even-parity wave symmetry than expected in 3D AM with similar crystal symmetries. We confirm our finding by first-principles calculations of the electronic structure and magnetooptical response. We also propose that recent observations of the time-reversal symmetry breaking in the famous Fe-based superconducting chalchogenides, either in monolayer form or in the surface layer, may be related not to an FM, as previously assumed, but to the induced 2D AM order. Finally, we show that monolayer FeSe can simultaneously exhibit unconventional altermagnetic time-reversal symmetry breaking and quantized spin Hall conductivity indicating possibility to research an intriquing interplay of 2D altermagnetism with topological and superconducting states within a common crystal-potential environment.
Forward citations
Cited by 26 Pith papers
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Emergent d-wave altermagnetism in chlorine-adsorbed FeSe monolayer
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Vacancy-driven inverse Lieb geometry: A general route to $d$-wave altermagnetism in two dimensions
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On an odd-sublattice kagome lattice, non-uniform collinear orbital moments from CDW/loop-current order can form a d-wave altermagnet with spin-split bands, as possibly realized in AV3Sb5.
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Observation of the Optical Phonons in {\alpha}-MnTe films
MBE-grown alpha-MnTe films on GaAs(111)B exhibit Raman modes at 121 and 140 cm-1 identified as all symmetry-allowed optical phonons of the hexagonal NiAs lattice via experiment and DFT calculations.
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Coexistence of d-Wave Altermagnetism and Topological States in Janus FeSeX (X = S, Te) Monolayers
Janus FeSeX monolayers host coexisting d-wave altermagnetism without SOC and a SOC-induced topological gap with quantized spin Hall conductivity and nontrivial invariants.
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Nonlinear spin-Seebeck diode in $f$-wave magnets, third-order spin-Nernst effects in $g$-wave magnets and spin-Nernst effects in $i$-wave altermagnets
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