Helicity-Protected Domain-Wall Magnetoresistance in Ferromagnetic Weyl Semimetal

The magnetotransport properties of disordered ferromagnetic Weyl semimetals are investigated numerically. We found an extraordinarily stable and huge magnetoresistance effect in domain walls of Weyl semimetals. This effect originates from the helicity mismatch of Weyl fermions and is a specific prop...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2018-07, Vol.87 (7), p.73707
Main Authors: Kobayashi, Koji, Ominato, Yuya, Nomura, Kentaro
Format: Article
Language:English
Subjects:
Domain walls
Fermions
Ferromagnetism
Helicity
Magnetic properties
Magnetism
Magnetoresistance
Magnetoresistivity
Metalloids
Metals
Numerical analysis
Transport properties
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Summary:The magnetotransport properties of disordered ferromagnetic Weyl semimetals are investigated numerically. We found an extraordinarily stable and huge magnetoresistance effect in domain walls of Weyl semimetals. This effect originates from the helicity mismatch of Weyl fermions and is a specific property of Weyl semimetals. Although conventional magnetoresistance effects are strongly suppressed in domain walls where local magnetization varies gradually, the helicity-protected magnetoresistance in Weyl semimetals maintains almost 100% of the magnetoresistance ratio for any kind of thick domain walls, even in the presence of disorder. The contribution of surface Fermi arcs to the magnetoresistance is also discussed.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.87.073707