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MA: Fachverband Magnetismus

MA 29: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 29.6: Vortrag

Mittwoch, 11. März 2026, 11:15–11:30, POT/0112

Spin-charge and Orbital-charge Interconversion on SrTiO3-based Two-dimensional Electron Gases: A Semiclassical Approach — •Le Viet Duc Pham and Annika Johansson — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle (Saale), Germany

Two-dimensional electron gases (2DEGs) at SrTiO3-based oxide interfaces display large, gate-tunable Rashba-like spin-orbit coupling (SOC) that enables spin-charge interconversion via the spin Edelstein effect [1, 2]. It has also been demonstrated that the orbital Edelstein effect, i.e, current-induced orbital magnetization, is larger than the spin Edelstein effect by more than one order of magnitude [3]. Yet, most transport studies assume a constant relaxation time [1, 3], potentially underestimating the role of anisotropic relaxation times and scattering-in contributions. Here, we systematically study charge-spin and charge-orbital conversion in SrTiO3-based 2DEGs, combining the Boltzmann semiclassical transport theory and various ansatzes for the scattering terms, such as constant relaxation time, momentum relaxation time, as well as scattering on various impurity potentials. Comparing different scattering approaches, we gain insights into the influence of impurity scattering on charge-spin and charge-orbital interconversion phenomena.

[1] Vaz, Diogo C., et al. Nature Materials 18.11 (2019): 1187-1193. [2] Caviglia, A. D., et al. Physical Review Letters 104.12 (2010): 126803. [3] Johansson, Annika, et al. Physical Review Research 3.1 (2021): 013275.

Keywords: Charge-spin interconversion; Charge-orbital interconversion; Edelstein effect; Spin-orbitronics