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Quantum Hall effect in a bulk antiferromagnet EuMnBi2 with magnetically confined two-dimensional Dirac fermions

机译:具有磁约束二维狄拉克费米子的体反铁磁体EuMnBi2中的量子霍尔效应

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摘要

For the innovation of spintronic technologies, Dirac materials, in which low-energy excitation is described as relativistic Dirac fermions, are one of the most promising systems because of the fascinating magnetotransport associated with 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 report a bulk half-integer quantum Hall effect in a layered antiferromagnet EuMnBi2, 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 of more than 10,000 cm2/V s, 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.
机译:对于自旋电子技术的创新,由于低能量激发被称为相对论狄拉克费米子,狄拉克材料是最有前途的系统之一,因为它具有极高的迁移率,从而吸引人的磁传输。为了将狄拉克费米子并入自旋电子学应用中,需要通过固体中的磁序在很大程度上操纵其量子传输现象。我们报告了层状反铁磁体EuMnBi2中的整体半整数量子霍尔效应,其中场可控Eu磁阶显着抑制了Dirac费米子与Bi层之间的层间耦合。除了具有超过10,000 cm 2 / V s的高迁移率之外,即使在大块磁体中,也可能由于自旋和谷值简并性的升高而引起了Landau能级分裂。这些结果将为磁功能化狄拉克材料的工程设计铺平道路。

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