Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M44: Topological Magnetic Textures
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 316
Sponsoring
Unit:
DMP
Chair: Hong Li, Boston College
Abstract: M44.00004 : Topological spin textures stabilised by Weyl fermions
9:24 AM–9:36 AM
Presenter:
Juba Bouaziz
(Forschungszentrum Jülich GmbH)
Authors:
Juba Bouaziz
(Forschungszentrum Jülich GmbH)
Gustav Bihlmayer
(Forschungszentrum Jülich GmbH)
Julie Staunton
(The university of Warwick)
Stefan Blügel
(Forschungszentrum Jülich GmbH)
relying on Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions between the localized 4f-moments [1].
In non-centrosymmetric REI, namely REAlGe (Si), the breaking of inversion symmetry generates Weyl
nodes which display interesting topological properties. The Weyl fermions mediate highly anisotropic
RKKY interactions leading to the emergence of Kitaev (KT) and Dzyloshinksii-Moriya (DM) interactions.
In presence of an external magnetic field non-trivial textures such as merons are observed [2]. We perform
a systematic first-principles analysis in the framework of the DFT+U for REAlGe (RE=Ce-Gd) and investigate
the contributions of the different exchange interactions (isotropic, DM, and KT) to the incommensurate order.
The local crystal field coefficients are computed from first-principles as well [3], and are used to evaluate the
magneto-crystalline anisotropy. Finally, we employ atomistic spin-dynamic simulations and identify the magnetic
phases that are stabilized in presence of an external magnetic field. Our analysis aims at drawing a direct
connection between the topology of the electronic band structure and the topology of the spin structures in
real space.
[1] J. Bouaziz et al. PRL 128, 157206 (2022); [2] P. Puphal et al. PRL 124, 017202 (2020); [3] C.E. Patrick et al. JPCM 31, 305901 (2019)
*This work was supported by from the European Research Council (ERC Grant No. 856538, project ``3D MAGiC'’).
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