Topological metal state in helimagnets
Abstract
A theory for nontrivial topology of band structure in metallic helimagnets is developed. Two theorems on electron dispersion in helimagnets are proved. They reveal a Kramers-like degeneracy in helical magnetic field. The generalized Bloch theorem together with periodic boundary conditions lead to a nontrivial topological band structure. As a result, an unusual spin structure of electron bands appears. A 2D model of nearly free electrons is proposed to describe conductive hexagonal palladium layers under an effective field of magnetically ordered CrO spacers in PdCrO. The spin texture of the Fermi surface induces abnormal conductivity and nonreciprocity of electronic transport. It is shown that the topological metal state is closely related to unconventional antiferromagnets.
Cite
@article{arxiv.2412.16726,
title = {Topological metal state in helimagnets},
author = {Yu. B. Kudasov},
journal= {arXiv preprint arXiv:2412.16726},
year = {2024}
}