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TT: Fachverband Tiefe Temperaturen

TT 64: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

TT 64.3: Talk

Thursday, March 21, 2024, 10:00–10:15, H 2013

Using first principles methods to describe spin-orbitronic and superconducting phenomena — •Tom G. Saunderson^1,2, Dongwook Go^1,2, Maria Teresa Mercaldo³, Mario Cuoco⁴, Martin Gradhand^1,5, and Yuriy Mokrousov^1,2 — ¹Institute of Physics, JGU, 55099 Mainz, Germany — ²PGI and IAS, Forschungszentrum Jülich, Germany — ³Universitá di Salerno, IT-84084 Fisciano, Italy — ⁴CNR-SPIN, IT-84084 Fisciano (SA), Italy — ⁵University of Bristol, Bristol BS8 1TL, UK

Recent advancements in orbitronics demonstrate remarkable efficiency gains using cost-effective materials [1], while spin-Hall mediated responses notably intensify near the superconducting transition [2]. Breaking inversion or time-reversal symmetry efficiently extracts these unconventional currents, however for material-specific predictions first principles techniques are essential. Although theoretical methods for orbital currents are well-established, first principles techniques for supercurrents are still in their infancy. This talk aims to explore two approaches. Firstly, we employ maximally localized Wannier functions to investigate the influence of p-d hybridizations on enhancing the orbital Rashba Edelstein effect on particular surfaces of known metallic systems. Secondly, we utilize a Green's function-based superconducting first principles code to induce unconventional triplet densities in superconductors featuring complex orbital degrees of freedom and inversion symmetry breaking. Such methods will pave the way for first principles-based modeling of superconducting spintronics. [1] Nature 619, 52 (2023) [2] ACS Nano 14, 15874 (2020)

Keywords: Magnetism; Superconductivity; Spintronics; Orbitronics