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TT: Fachverband Tiefe Temperaturen

TT 40: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)

TT 40.3: Vortrag

Mittwoch, 19. März 2025, 18:00–18:15, H19

Vectorial flow of the Berry curvature and its relation to the transport and band structure — •Jaroslav Hamrle^1,2, Ondřej Stejskal¹, Milan Vrána^2,1, and Martin Veis² — ¹Czech Technical University, Prague, Czechia — ²Charles University, Prague, Czechia

Berry curvature expresses the curvature of the reciprocal space, in a similar manner as magnetic field express curvature of the real space, resulting in a curved transport of electrons in solids. Therefore, Berry curvature is a base of various lossless transport phenomena such as anomalous Hall effect, anomalous Nerst effect, orbital magnetization or electric polarization. Here, in model materials bcc Fe and Fe₃Ga, we demonstrate details of the vectorial flow of the Berry curvature (monopole source, 1-dimensional flow, 2-dimensional flow), and its relations to the band structure, orbital magnetization as well as anomalous Hall and Nerst effects.

• [1] O. Stejskal, M. Veis, J. Hamrle, Sci Rep 12, 97 (2022) [doi: 10.1038/s41598-021-04076-z]
• [2] O. Stejskal, M. Veis, J. Hamrle, Phys. Rev. Materials 7, 084403 (2023) [doi:10.1103/PhysRevMaterials.7.084403]

Keywords: Berry curvature; flow of Berry curvature; Anomalous Hall effect