Year: 2024
Type: preprint
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$_2$ spacers in PdCrO$_2$. 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.
Source: arXiv (Cornell University)
Author: Kudasov, Yu. B.
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4405766347