Topological metal state in helimagnets
| Autor: | Kudasov, Yu. B. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. |
| Databáze: | arXiv |
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