Anisotropic magnetotransport in Dirac-Weyl magnetic junctions
Yuya Ominato, Koji Kobayashi, and Kentaro Nomura
TL;DR
This paper theoretically investigates anisotropic magnetotransport in Dirac-Weyl magnetic junctions, revealing a large AMR driven by Fermi surface shifts, distinct from conventional mechanisms.
Contribution
It introduces a new understanding of AMR in Weyl semimetals, highlighting a mechanism based on Fermi surface shifts rather than spin-dependent scattering.
Findings
Large anisotropic magnetoresistance observed
AMR depends on Fermi energy and exchange interaction
Fermi surface shift is the origin of AMR
Abstract
We theoretically study the anisotropic magnetotransport in Dirac-Weyl magnetic junctions where a doped ferromagnetic Weyl semimetal is sandwiched between doped Dirac semimetals. We calculate the conductance using the Landauer formula and find that the system exhibits extraordinarily large anisotropic magnetoresistance (AMR). The AMR depends on the ratio of the Fermi energy and the strength of the exchange interaction. The origin of the AMR is the shift of the Fermi surface in the Weyl semimetal and the mechanism is completely different from the conventional AMR originating from the spin dependent scattering and the spin-orbit interaction.
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