Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 32: Spin Transport and Orbitronics, Spin-Hall Effects II (joint session MA/TT)
MA 32.6: Vortrag
Mittwoch, 19. März 2025, 18:45–19:00, H19
Orbital Edelstein contribution to the spin-charge conversion in Germanium Telluride — •Sergio Leiva-Montecinos1, Libor Vojáek2, Jing Li2, Mairbeck Chshiev2, Ingrid Mertig1, and Annika Johansson3 — 1Martin Luther University Halle-Wittenberg, Halle (Saale), Germany — 2Université. Grenoble Alpes, CEA, CNRS, SPINTEC, Grenoble, France — 3Max Planck Institute of Microstructure Physics, Halle (Saale), Germany
The Edelstein effect (EE) is a promising mechanism for generating spin and orbital polarization from charge currents in systems without inversion symmetry. In ferroelectric materials, such as Germanium Telluride (GeTe), the combination of bulk Rashba splitting and voltage-controlled ferroelectric polarization provides a pathway for reversible spin-charge interconversion [1, 2].
In this work, we investigate current-induced spin and orbital magnetization in bulk GeTe using Wannier-based tight-binding models derived from DFT calculations and semiclassical Boltzmann theory. Employing the modern theory of orbital magnetization (MTOM), we demonstrate that the orbital Edelstein effect (OEE) entirely dominates its spin counterpart (SEE). This difference is visualized through the spin and orbital textures at the Fermi surfaces, where the orbital moment surpasses the spin moment by one order of magnitude. Moreover, the OEE remains largely unaffected when we suppress the spin-orbit coupling, highlighting its distinct physical origin compared to the SEE.
[1] D. Di Sante et al., Adv. Mater. 25, 509 (2012).
[2] C. Rinaldi et al., Nano Lett. 18, 2751 (2018).
Keywords: Edelstein effect; Orbitronics; Ferroelectric; Germanium Telluride; Spin transport