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Chiral anomaly factory: Creating Weyl fermions with a magnetic field

Author(s): Cano, Jennifer; Bradlyn, Barry; Wang, Zhijun; Hirschberger, Max; Ong, Nai Phuan; et al

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Abstract: Weyl fermions can be created in materials with both time reversal and inversion symmetry by applying a magnetic field, as evidenced by recent measurements of anomalous negative magnetoresistance. Here, we do a thorough analysis of the Weyl points in these materials: By enforcing crystal symmetries, we classify the location and monopole charges of Weyl points created by fields aligned with high-symmetry axes. The analysis applies generally to materials with band inversion in the Td, D4h, and D6h point groups. For the Td point group, we find thatWeyl nodes persist for all directions of the magnetic field. Further, we compute the anomalous magnetoresistance of field-createdWeyl fermions in the semiclassical regime. We find that the magnetoresistance can scale nonquadratically with magnetic field, in contrast to materials with intrinsicWeyl nodes. Our results are relevant to future experiments in the semiclassical regime.
Publication Date: 15-Apr-2017
Electronic Publication Date: 17-Apr-2017
Citation: Cano, Jennifer, Bradlyn, Barry, Wang, Zhijun, Hirschberger, Max, Ong, NP, Bernevig, BA. (2017). Chiral anomaly factory: Creating Weyl fermions with a magnetic field. PHYSICAL REVIEW B, 95 (10.1103/PhysRevB.95.161306
DOI: doi:10.1103/PhysRevB.95.161306
ISSN: 2469-9950
EISSN: 2469-9969
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. This is an open access article.

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