Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 28: Topological Insulators (joint session MA/HL)
HL 28.5: Talk
Tuesday, March 18, 2025, 15:00–15:15, H16
Non-relativistic linear Edelstein effect in noncollinear EuIn2As2 — •Adriana Nayra Alvarez Pari1, Rodrigo Jaeschke Ubiergo1, Atasi Chakraborty1, Jairo Sinova1,5, and Libor Smejkal1,2,3,4 — 1Institut für Physik, Johannes Gutenberg Universität, Mainz, Germany — 2Max Plank Institute for the Physics of Complex Systems, Dresden, Germany — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 4Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic — 5Department of Physics, Texas A & M University, Texas, USA
Motivated by the ongoing interest in understanding the actual magnetic ground state of the promising axion insulator candidate EuIn2As2, we present here a spin symmetry analysis and ab-initio calculations, aiming to identify specific exchange-dominated physics that could offer insights into the current debate. We investigate two non-collinear coplanar magnetic orders reported in this compound: the helical and broken-helical phases [1]. Our symmetry analysis shows that magnetic-exchange alone results in the formation of an out-of-plane odd-wave order in momentum space in both phases. Additionally, we identify an in-plane g-wave order that emerges exclusively in the broken-helical phase, providing a distinguishing feature for this phase. Furthermore, we report a non-relativistic Edelstein effect with a distinct out-of-plane polarized spin density that dominates over spin-orbit coupling effects.
[1] Pari, Nayra A. Álvarez, et al. "Non-relativistic linear Edelstein effect in non-collinear EuIn2As2." arXiv:2412.10984 (2024)
Keywords: Edelstein Effect; Axion insulator; Helical; g-wave; odd-wave