Creating Weyl nodes and controlling their energy by magnetization rotation
Name
PhysRevResearch.1.032044.pdf
Description
Published version
Size
1.23 MB
Format
Adobe PDF
Checksum (MD5)
464a57ba787ed54a42a6417828de941a
Author(s)
Ghimire, Madhav Prasad
Facio, Jorge I
You, Jhih-Shih
Ye, Linda
Checkelsky, Joseph
Fang, Shiang
Kaxiras, Efthimios
Richter, Manuel
van den Brink, Jeroen
Date Issued
December 2019
Journal
Physical Review Research
Publisher
American Physical Society (APS)
Citation
Ghimire, Madhav Prasad et al. "Creating Weyl nodes and controlling their energy by magnetization rotation." Physical Review Research 1, 3 (December 2019): 032044(R)
Version
Final published version
Abstract
As they do not rely on the presence of any crystal symmetry, Weyl nodes are robust topological features of an electronic structure that can occur at any momentum and energy. Acting as sinks and sources of Berry curvature, Weyl nodes have been predicted to strongly affect the transverse electronic response, like in the anomalous Hall or Nernst effects. However, to observe large anomalous effects the Weyl nodes need to be close to or at the Fermi level, which implies the band structure must be tuned by an external parameter, e.g., chemical doping. Here we show that in a ferromagnetic metal tuning of the Weyl node energy and momentum can be achieved by rotation of the magnetization. First, taking as example the elementary magnet hcp-Co, we use electronic structure calculations based on density-functional theory to show that by canting the magnetization away from the easy axis, Weyl nodes can be driven exactly to the Fermi surface. Second, we show that the same phenomenology applies to the kagome ferromagnet Co₃Sn₂S₂, in which we additionally show how the dynamics in energy and momentum of the Weyl nodes affects the calculated anomalous Hall and Nernst conductivities. Our results highlight how the intrinsic magnetic anisotropy can be used to engineer Weyl physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVRESEARCH.1.032044
