Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 14: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 14.8: Talk

Tuesday, March 18, 2025, 11:30–11:45, H18

Spin and orbital Hall effect in metal systems: extrinsic vs. intrinsic contributions — •Sergiy Mankovsky and Hubert Ebert — LMU of Munich, 81377 Munich, Germany

Kubo’s linear response formalism has been used to study the orbital Hall effect (OHE) for non-magnetic undoped and doped metallic systems, focusing on the impact of different types of disorder. Corresponding first-principles calculations of the orbital Hall conductivity (OHC) were performed making use of the KKR Green function method that allows in particular to monitor the impact of the vertex corrections on the OHC. The doping- and temperature-dependence of the OHC have been investigated and compared with corresponding results for the spin Hall conductivity (SHC). The temperature dependent properties of the OHC and SHC determined by thermally induced lattice vibrations (in non-magnetic materials) and spin fluctuations (in magnetic systems) have been accounted for making use of the alloy analogy model. For elemental systems at finite temperature a dominating role of the intrinsic contribution to the temperature-dependent OH and SH conductivities is found. In contrast, the OH and SH conductivities of doped systems at low temperatures are dominated by the SOC-driven extrinsic contributions strongly decreasing at higher temperatures due to the increasing impact of the electron-phonon scattering.

Keywords: Orbital Hall effect; Spin Hall effect; electronic structure; chemical and thermal disorder; spin-orbit coupling