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• W3013722374 abstract "Magnetic materials with high mobilities are intriguing subject of research from both fundamental and application perspectives. Based on first-principle calculations, we investigate the physical properties of the already synthesized AMnBi(A =K, Rb, Cs)-family materials. We show that these materials are antiferromagnetic (AFM), with Neel temperatures above 300 K. They contain AFM ordered Mn layers, while the interlayer coupling changes from ferromagnetic (FM) for KMnBi to AFM for RbMnBi and CsMnBi. We find that these materials are narrow gap semiconductors. Owing to the small effective mass, the electron carrier mobility can be very high, reaching up to 100,000 cm2/(Vs) for KMnBi. In contrast, the hole mobility is much suppressed, typically lower by two orders of magnitude. We further study their two-dimensional (2D) single layer structures, which are found be AFM with fairly high mobility (1000 cm2/(Vs)). Their Neel temperatures can still reach room temperature. Interesting, we find that the magnetic phase transition is also accompanied by a metal-insulator phase transition, with the paramagnetic metal phase possessing a pair of nonsymmorphic-symmetry-protected 2D spin-orbit Dirac points. Furthermore, the magnetism can be effectively controlled by the applied strain. When the magnetic ordering is turned into FM, the system can become a quantum anomalous Hall insulator with gapless chiral edge states." @default.
• W3013722374 created "2020-04-03" @default.
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• W3013722374 date "2020-07-30" @default.
• W3013722374 modified "2023-10-18" @default.
• W3013722374 title "First-principles study of bulk and two-dimensional structures of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>A</mml:mi><mml:mi mathvariant=normal>MnBi</mml:mi></mml:math> family of materials <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant=normal>K</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant=normal>Rb</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant=normal>Cs</mml:mi><mml:mo>)</mml:…" @default.
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• W3013722374 doi "https://doi.org/10.1103/physrevb.102.035444" @default.
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