| 研究実績の概要 |
In the last year, we have focused on the interplay between the Kondo effect and magnetic properties (1) and at the influence of a Rashba-like hybridization on the emergence of exceptional points (2) in non-centrosymmetric f-electron materials.
(1) As commonly known in f-electron materials, the magnetic phase competes with the paramagnetic phase dominated by the Kondo effect. In non-centrosymmetric f-electron materials, the Rashba interaction affects both phases by splitting the electronic bands for different spin-directions. We found that the Rashba interaction can strengthen the antiferromagnetic phase in these materials. An antiferromagnetic phase is formed in the non-centrosymmetric system even for hybridization strengths, for which in the centrosymmetric system, the Kondo effect dominates, and a paramagnetic phase is formed. Most strikingly, we found that this antiferromagnetic phase with strong Rashba interaction is metallic, and we were able to show that this metallic antiferromagnetic phase exhibits a strong magnetoelectric effect, which can be used for spintronics devices.
(2) In a second project, we have analyzed the emergence of exceptional points in f-electron materials with Rashba-like hybridization. We have demonstrated that the exceptional points can occur in these materials, which are connected by Fermi arcs. Furthermore, we have shown that there are complex manifolds of exceptional points in the combined space of momentum and energy, which change their shape when the temperature is increased or decreased.
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