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Altermagnetic ferroelectric LiFe2F6 and spin-triplet excitonic insulator phase
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Altermagnetism is a new magnetic phase with k-dependent spin polarization and may exist in an insulating state with a high N\'eel temperature. This provides a new opportunity to obtain both spin and electric polarization in one material. Here, based on symmetry analysis and the first-principles electronic structures calculations, we predict that LiFe2F6 is a d-wave altermagnetic and charge-ordering-mediated ferroelectric material. Moreover, the LiFe2F6 transforms into a ferrimagnetic and ferroelectric phase with strong magnetoelectric coupling under biaxial compressive strain. Interestingly, the spins of the valence band and the conduction band are opposite in ferrimagnetic LiFe2F6, which facilitates a simultaneous spin-triplet excitonic insulator phase. More importantly, the spin-triplet excitons with spin 1 and -1 can be switched by electric fields in ferrimagnetic LiFe2F6 due to strong magnetoelectric coupling. Due to the abundance of novel physical properties, LiFe2F6 will certainly attract a wide range of theoretical and experimental interest.
Forward citations
Cited by 5 Pith papers
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Anomalous charge density wave in altermagnetism
Monolayer altermagnetic WO is predicted to host a sqrt(2) x sqrt(2) charge density wave that raises the density of states at the Fermi level, an anomalous CDW.
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Emergent d-wave altermagnetism in chlorine-adsorbed FeSe monolayer
Hole-doped, single-side Cl-adsorbed monolayer FeSe is predicted to host a robust d-wave altermagnetic state with up to 620 meV spin splitting.
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Ultrafast optical route to coupled ferroelectric and altermagnetic switching
LiV2F6 is predicted to host charge-order-induced altermagnetism and ferroelectricity that reverse together under ultrafast laser-driven charge transfer in about 15 fs.
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Recent Advances in Unconventional Ferroelectrics and Multiferroics
A review of unconventional ferroelectric and multiferroic materials, surveying mechanisms, material candidates, and potential device applications.
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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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