Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals
Abstract
We study correlations and magnetic textures of localized spins, doped in three-dimensional Dirac semimetals. An effective field theory for magnetic moments is constructed by integrating out the fermionic degrees of freedom. The spin correlation shows a strong anisotropy, originating from spin-momentum locking of Dirac electrons, in addition to the conventional Heisenberg-like ferromagnetic correlation. The anisotropic spin correlation allows topologically nontrivial magnetic excitation textures such as a transient hedgehog state, as well as the ferromagnetic ground state. The spin-wave dispersion in ferromagnetic Weyl semimetal also becomes anisotropic, being less dispersed perpendicular to the magnetization.
Keywords
Cite
@article{arxiv.1511.08381,
title = {Spin textures and spin-wave excitations in doped Dirac-Weyl semimetals},
author = {Yasufumi Araki and Kentaro Nomura},
journal= {arXiv preprint arXiv:1511.08381},
year = {2016}
}
Comments
5 pages, 3 figures + 9 pages of Supplemental Material