Angular Dependence of Interlayer Magnetoresistance for Antiferromagnetic Dirac Semimetal AMnBi2 (A = Sr, Eu)

Kondo, Masaki; Sakai, Hideaki; Komada, M.; Murakawa, H.; Hanasaki, N.

doi:10.7566/jpscp.30.011016

Cited by 3 publications

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“…room temperature [21][22][23][26][27][28][29][30] , the quasi-2D Dirac fermion states are formed in the bulk form. For the layer stacking with a coincident arrangement of the A-sites above and below the X − layer, the X − layer tends to form a square net, leading to a nonpolar tetragonal structure [21][22][23][24][25] . However, in BaMnSb 2 , the Sb − layer is slightly distorted to an orthorhombic one with zig-zag chains, leading to lattice polarization along the plane.…”

Section: A Cmentioning

confidence: 99%

“…Recently, the layered Dirac material BaMnSb 2 was found to have a polar structure with broken in-plane inversion symmetry in the bulk form 19,20 . BaMnSb 2 belongs to the AMnX 2 (A: alkaline earth, X: Bi, Sb) series of compounds [21][22][23][24][25][26][27] , in which each compound consists of a A 2+ -Mn 2+ -X 3− blocking layer and a X − Dirac fermion layer (see Fig. 1a).…”

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Tunable spin-valley coupling in layered polar Dirac metals

et al. 2021

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In non-centrosymmetric metals, spin-orbit coupling induces momentum-dependent spin polarization at the Fermi surfaces. This is exemplified by the valley-contrasting spin polarization in monolayer transition metal dichalcogenides with in-plane inversion asymmetry. However, the valley configuration of massive Dirac fermions in transition metal dichalcogenides is fixed by the graphene-like structure, which limits the variety of spin-valley coupling. Here, we show that the layered polar metal BaMnX2 (X = Bi, Sb) hosts tunable spin-valley-coupled Dirac fermions, which originate from the distorted X square net with in-plane lattice polarization. We found that BaMnBi2 has approximately one-tenth the lattice distortion of BaMnSb2, from which a different configuration of spin-polarized Dirac valleys is theoretically predicted. This was experimentally observed as a clear difference in the Shubnikov-de Haas oscillation at high fields between the two materials. The chemically tunable spin-valley coupling in BaMnX2 makes it a promising material for various spin-valleytronic devices.

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confidence: 99%

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Tunable spin-valley coupling in layered polar Dirac metals

et al. 2021

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“…Since the former layer is an antiferromagnetic insulator with a Néel temperature around room temperature [21][22][23][26][27][28][29][30] , the quasi-2D Dirac fermion states are formed in the bulk form. For the layer stacking with a coincident arrangement of the A-sites above and below the X − layer, the X − layer tends to form a square net, leading to a non-polar tetragonal structure [21][22][23][24][25] . However, in BaMnSb 2 , the Sb − layer is slightly distorted to an orthorhombic one with zig-zag chains, leading to lattice polarization along the plane.…”

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confidence: 99%

Tunable spin-valley coupling in layered polar Dirac metals

Kondo,

Ochi,

Kojima

et al. 2021

Preprint

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In non-centrosymmetric metals, spin-orbit coupling (SOC) induces momentum-dependent spin polarization at the Fermi surfaces. This is exemplified by the valley-contrasting spin polarization in monolayer transition metal dichalcogenides (TMDCs) with in-plane inversion asymmetry. However, the valley configuration of massive Dirac fermions in TMDCs is fixed by the graphene-like structure, which limits the variety of spin-valley coupling. Here, we show that the layered polar metal BaMnX 2 (X =Bi, Sb) hosts tunable spin-valley-coupled Dirac fermions, which originate from the distorted X square net with in-plane lattice polarization. We found that in spite of the larger SOC, BaMnBi 2 has approximately one-tenth the lattice distortion of BaMnSb 2 , from which a different configuration of spin-polarized Dirac

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High-field Studies on Layered Magnetic and Polar Dirac Metals: Novel Quantum Transport Phenomena Coupled with Spin-valley Degrees of Freedom

Sakai

2022

J. Phys. Soc. Jpn.

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Recently, the interplay between the Dirac/Weyl fermion and various bulk properties, such as magnetism, has attracted considerable attention, since unconventional transport and optical phenomena were discovered. However, the design principles for such materials have not been established well. Here, we propose that the layered material AMnX 2 (A: alkaline and rare-earth ions, X: Sb, Bi) is a promising platform for systematically exploring strongly correlated Dirac metals, which consists of the alternative stack of the X − square net layer hosting a 2D Dirac fermion and the A 2+ -Mn 2+ -X 3− magnetic block layer. In this article, we shall review recent high-field studies on this series of materials to demonstrate that various types of Dirac fermions are realized by designing the block layer. First, we give an overview of the Dirac fermion coupled with the magnetic order in EuMnBi 2 (A=Eu). This material exhibits large magnetoresistance by the field-induced change in the magnetic order of Eu layers, which is associated with the strong exchange interaction between the Dirac fermion and the local Eu moment. Second, we review the Dirac fermion coupled with the lattice polarization in BaMnX 2 (A=Ba). There, spin-valley coupling manifests itself owing to the Zeeman-type spin-orbit interaction, which is experimentally evidenced by the bulk quantum Hall effect observed at high fields.

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Angular Dependence of Interlayer Magnetoresistance for Antiferromagnetic Dirac Semimetal AMnBi₂ (A = Sr, Eu)

Cited by 3 publications

References 12 publications

Tunable spin-valley coupling in layered polar Dirac metals

Tunable spin-valley coupling in layered polar Dirac metals

Tunable spin-valley coupling in layered polar Dirac metals

High-field Studies on Layered Magnetic and Polar Dirac Metals: Novel Quantum Transport Phenomena Coupled with Spin-valley Degrees of Freedom

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