title: Quantum Hall effect in a bulk antiferromagnet EuMnBi2 with magnetically confined two-dimensional Dirac fermions.
abstract: 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 cm(2)/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.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Masuda
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.; Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Sakai
authors.affiliation: The Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Tokunaga
authors.affiliation: Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan.; RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Yamasaki
authors.affiliation: The Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Miyake
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Shiogai
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Nakamura
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Awaji
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tsukazaki
authors.affiliation: Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan.
authors.forename: Hironori
authors.initials: H
authors.lastname: Nakao
authors.affiliation: Condensed Matter Research Center and Photon Factory, Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan.
authors.forename: Youichi
authors.identifier: 0000-0003-4507-4209
authors.initials: Y
authors.lastname: Murakami
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.; Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan.
authors.forename: Taka-hisa
authors.initials: TH
authors.lastname: Arima
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.; RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.; PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ishiwata
mesh_terms: D008962:Models, Theoretical; D010825:Physics
keywords: Berry’s phase; Bi square net; Dirac fermions; europium; layered antiferromagnet; magnetoresistance; quantum hall effect; resonant x-ray magnetic scattering; spin flop transition; spintronics