Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions

Abstract

For the innovation of spintronic technologies, Dirac materials, in which the low-energy excitation is described as relativistic Dirac fermions, are one of the most promising systems, because of the fascinating magnetotransport associated with the extremely high mobility. To incorporate Dirac fermions into spintronic applications, their quantum transport phenomena are desired to be manipulated to a large extent by magnetic order in a solid. We here report a bulk half-integer quantum Hall effect in a layered antiferromagnet EuMnBi${}_2$, in which field-controllable Eu magnetic order significantly suppresses the interlayer coupling between the Bi layers with Dirac fermions. In addition to the high mobility more than 10,000 cm${}^2$/Vs, Landau level splittings presumably due to the lifting of spin and valley degeneracy are noticeable even in a bulk magnet. These results will pave a route to the engineering of magnetically functionalized Dirac materials.

26 pages, 4 figures, 1 table

References in corpus (8)

• Room-Temperature Quantum Hall Effect in Graphene
• Unconventional Integer Quantum Hall effect in graphene
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Effect of Eu magnetism on the electronic properties of the candidate Dirac material EuMnBi2
• Dirac and Normal Fermions in Graphite and Graphene: Implications to the Quantum Hall Effect
• Bulk crystal growth and electronic characterization of the 3D Dirac Semimetal Na3Bi

Cited by in corpus (23)

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• Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb${}_2$
• Magnetic mixed valent semimetal EuZnSb${}_2$ with Dirac states in the band structure
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• Resonant X-ray scattering study of diffuse magnetic scattering from the topological semimetals EuCd${}_2$As${}_2$ and EuCd${}_2$Sb${}_2$
• Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal
• Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$
• Prediction of the High Thermoelectric Performance of Pnictogen Dichalcogenide Layered Compounds with Quasi-One-Dimensional Gapped Dirac-like Band Dispersion
• Magneto-transport and Electronic Structures of BaZnBi${}_2$
• Robust narrow-gap semiconducting behavior in square-net La${}_3$Cd${}_2$As${}_6$
• Butterfly-shaped magnetoresistance in triangular-lattice antiferromagnet Ag${}_2$CrO${}_2$
• Magnetotransport studies of the Sb square-net compound LaAgSb${}_2$ under high pressure and rotating magnetic fields
• Spin dynamics of a magnetic Weyl semimetal Sr${}_{1-x}$Mn${}_{1-y}$Sb${}_2$
• Unusual Electronic Structure of Dirac Material BaMnSb${}_2$ Revealed by Angle-Resolved Photoemission Spectroscopy
• Molecular beam deposition of a new layered pnictide with distorted Sb square nets
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• Increased hole mobility in anti-ThCr${}_2$Si${}_2$-type La${}_2$O${}_2$Bi co-sintered with alkaline earth metal oxides for oxygen intercalation and hole carrier doping
• Fermionic Order by Disorder in a van der Waals Antiferromagnet